diff --git a/Web/Controls/Help/GettingStarted/Documents/GettingStartedDocuments.ascx b/Web/Controls/Help/GettingStarted/Documents/GettingStartedDocuments.ascx
index 5de399e97..51014862c 100644
--- a/Web/Controls/Help/GettingStarted/Documents/GettingStartedDocuments.ascx
+++ b/Web/Controls/Help/GettingStarted/Documents/GettingStartedDocuments.ascx
@@ -122,12 +122,13 @@
 				<li><b>Document</b> to create a new text document</li>
 				<li><b>Spreadsheet</b> to create a new spreadsheet</li>
 				<li><b>Presentation</b> to create a new presentation</li>
-                <li><b>Form template</b> to create a new <b>.docxf</b> file which allows editing text and working with form fields. Choose one of the options:
+                <li><b>PDF Form</b> to create a new <b>.docxf</b> file which allows editing text and working with form fields. Choose one of the options:
                     <ul>
-                        <li><b>From blank</b> to create an empty <b>.docxf</b> file.</li>
-                        <li><b>From text document</b> to create a <b>.docxf</b> file on the base of an existing <b>.docx</b> document. Select the necessary file stored on your portal and click <b>Create</b>.</li>
+                        <li><b>Blank</b> to create an empty <b>.docxf</b> file.</li>
+                        <li><b>From portal file</b> to create a <b>.docxf</b> file on the base of an existing <b>.docx</b> document stored on your portal. Select the necessary file and click <b>Create</b>.</li>
+                        <li><b>From local file</b> to create a <b>.docxf</b> file on the base of an existing <b>.docx</b> document stored on your computer. Select the necessary file and click <b>Open</b>.</li>
                     </ul>
-                    <p>To learn more on how to create a Form template, you can refer to <a target="_blank" href="<%=VirtualPathUtility.ToAbsolute("~/ONLYOFFICE-Editors/ONLYOFFICE-Document-Editor/UsageInstructions/CreateFillableForms.aspx")%>">this article</a>.</p>
+                    <p>To learn more on how to create a fillable form, you can refer to <a target="_blank" href="<%=VirtualPathUtility.ToAbsolute("~/ONLYOFFICE-Editors/ONLYOFFICE-Document-Editor/UsageInstructions/CreateFillableForms.aspx")%>">this article</a>.</p>
                 </li>
 				<li><b>Folder</b> to create a new folder</li>
 				</ul>
@@ -196,8 +197,8 @@
             <p>Use the <img alt="View Icons" src="<%=VirtualPathUtility.ToAbsolute("~/images/Help/GettingStarted/ViewIcons.png")%>" />  buttons on the right to switch between the available display modes: <em>Thumbnails view</em>, <em>Common view</em>, and <em>Compact view</em>. Thumbnails are not generated for connected third-party services.</p>
             <p>You can perform the following operations with your documents:</p>
 			<ul>
-                <li><b>Save as oform</b> - this option is only available for the <code>.docxf</code> Form templates</li>
-                <li><b>Fill in the form</b> - this option is only available for the <code>.oform</code> fillable forms</li>
+                <li><b>Save as PDF Form</b> - this option is only available for the <code>.docxf</code> forms</li>
+                <li><b>Fill in the form</b> - this option is only available for the <code>.pdf</code> fillable forms</li>
                 <li><b>Share</b> several documents at once for the portal users</li>
                 <li>Copy <b>Quick external link</b> to a file with default permissions for people outside the portal. The default access type is specified in Settings / Common / Default access rights in sharing settings / Default access rights for a specific file type.</li>
                 <li>Copy the <b>link</b> to a file or folder to clipboard <b>for portal users</b></li>
diff --git a/Web/Controls/Help/Guides/Documents/ShareDocuments/ShareDocuments.ascx b/Web/Controls/Help/Guides/Documents/ShareDocuments/ShareDocuments.ascx
index 2fca242c3..cf1b749d6 100644
--- a/Web/Controls/Help/Guides/Documents/ShareDocuments/ShareDocuments.ascx
+++ b/Web/Controls/Help/Guides/Documents/ShareDocuments/ShareDocuments.ascx
@@ -94,7 +94,7 @@
         <h2 id="step2_block">Sharing files directly from the editors</h2>
 	<div class="block_of_step">
 		<div class="screen_text">
-			<p>If you are editing a <code>.docx</code>/<code>.xlsx</code>/<code>.pptx</code> file or a <code>.docxf</code> form template, you can open the <b>Sharing Settings</b> window directly from the editor interface in one of the following ways:</p>
+			<p>If you are editing a <code>.docx</code>/<code>.xlsx</code>/<code>.pptx</code> file or a <code>.docxf</code> form, you can open the <b>Sharing Settings</b> window directly from the editor interface in one of the following ways:</p>
 			<ul>
 				<li>click the <img alt="Sharing" src="<%=VirtualPathUtility.ToAbsolute("~/OfficeWeb/apps/documenteditor/main/resources/help/images/src/icons/access_rights.png")%>" /> <b>Share</b> icon on the right side of the editor header;</li>
 				<li>switch to the <b>Collaboration</b> tab and click the <img alt="Sharing" src="<%=VirtualPathUtility.ToAbsolute("~/OfficeWeb/apps/documenteditor/main/resources/help/images/src/icons/sharingicon.png")%>" /> <b>Sharing</b> button at the top toolbar;</li>
@@ -374,8 +374,8 @@
 			<div class="screen_text">
 				<p>A user with <b>Form Filling</b> permissions can do the following:</p>
 				<ul>
-					<li>View the <code>.oform</code> fillable form, navigate between fields and fill in or clear the form fields. All other editing options except entering text into the form fields are not available.</li>
-					<li>The user can also save the file on the portal in the <code>.pdf</code> format, print the file, download the file in the <code>.pdf</code> or <code>.docx</code> format, open the file location and change the interface theme.</li>
+					<li>View the <code>.pdf</code> fillable form, navigate between fields and fill in or clear the form fields. All other editing options except entering text into the form fields are not available.</li>
+					<li>The user can also save the file on the portal in the <code>.pdf</code> format, print the file, switch to the File tab and download the form in one of the supported format, open the file location, <a target="_blank" href="<%=VirtualPathUtility.ToAbsolute("~/ONLYOFFICE-Editors/ONLYOFFICE-PDF-Editor/HelpfulHints/AdvancedSettings.aspx")%>">adjust advanced settings</a>.</li>
 				</ul>
 			</div>
 		</div>
diff --git a/Web/Controls/Help/Server/Community/CSChangelog.ascx b/Web/Controls/Help/Server/Community/CSChangelog.ascx
index 5d4ece743..ccf304695 100644
--- a/Web/Controls/Help/Server/Community/CSChangelog.ascx
+++ b/Web/Controls/Help/Server/Community/CSChangelog.ascx
@@ -1,7 +1,161 @@
 <%@ Control Language="C#" Inherits="BaseContentUserControls" %>
 <%@ Register Namespace="TeamLab.Controls" Assembly="__Code" TagPrefix="cc" %>
 <div class="changelog-open-in-new-window"><a target="_blank" href="<%=VirtualPathUtility.ToAbsolute("~/server/community/changelog.aspx")%>">Open in new window</a></div>
+
 <div class="changelog-version-block">
+    <p class="changelog-main-header">Version 12.6</p>
+    <p class="changelog-release-date">Release date: <span class="crd-date">02/29/2024</span></p>
+    <div class="changelog-switcher">
+        <p class="changelog-subheader">General portal changes</p>
+        <ul>
+            <li>Edited sources build.</li>
+            <li>Removed mail services transferred to a separate repository.</li>
+            <li>Hidden tariff for 1 and 3 years in SaaS.</li>
+            <li>Fixed issue when the ‘With opportunities’ filter does not display contacts that are specified as primary ones in Opportunities but are not specified on the Participants tab.</li>
+            <li>Fixed issue when the drop-down menu in the counter of the space occupied by a user goes out of the browser frame.</li>
+            <li>Added the ‘Copy email’ button for actions with user’s email.</li>
+            <li>Fixed issue when some GUI elements are displayed incorrectly when increasing the font in the browser settings.</li>
+            <li>Fixed issue when the ‘Color’ caption in the calendar editing window from the ‘Other Calendars’ list is formatted in bold.</li>
+            <li>Fixed issue when the uploaded contact logo does not displayed in the contact list.</li>
+            <li>Fixed issue with using the system theme by default for new users.</li>
+            <li>Fixed issue when the filter by group does not work.</li>
+            <li>Fixed issue when the request to upload an image to the server can be performed without cookie.</li>
+            <li>Fixed issue when the ‘Folder title’ field is missing in the ‘Change connection settings’ window for some third-party storages.</li>
+            <li>Fixed issue with an excess dividing line in the menu for a deactivated external link.</li>
+            <li>Fixed issue when the ‘Advanced settings’ menu differs in the Sharing Settings window of the manager and in the editor in the Common documents.</li>
+            <li>Added the ability to restrict access rights to the application files for the Others group.</li>
+            <li>Fixed issue with redirect to the portal main page when opening Control Panel after a day on Ubuntu 22.10.</li>
+            <li>Fixed the Server-Side Request Forgery (SSRF) vulnerability.</li>
+            <li>Fixed the 'Could not resolve current tenant' error when exporting a large number of contacts.</li>
+            <li>Fixed issue when the password recovery link does not work in EU and SG regions.</li>
+            <li>Replaced the mysql_native_password authorization plugin with a modern one.</li>
+            <li>Fixed issue with the ability to send requests to ApiSystem when expanding the default machinekey.</li>
+            <li>Implemented the recalculation progress bar.</li>
+            <li>Fixed issue when the “To” time is set incorrectly when selecting an area for an event in the Day, Week viewing mode.</li>
+            <li>Fixed issue with the direct link to connect Gmail Gmail via oauth (addons/mail/oauth.aspx).</li>
+            <li>Fixed issue with the XSS in the “Your subscription has expired” banner.</li>
+            <li>Fixed issue with the XSS sent in the attachment file is triggered.</li>
+            <li>Fixed issue when the page scrolls down when clicking Home/End in the search field (toolbar).</li>
+            <li>Fixed issue when Open Redirect is possible for an authentication link (refererurl) on the portal.</li>
+            <li>Fixed issue when the quick external link is available for administrators only.</li>
+            <li>Fixed issue with the 'Account' error when trying to log in as a blocked user.</li>
+            <li>Fixed issue when there is an ability to send the Change Email message to any participant under the user.</li>
+            <li>Fixed issue when logout from the portal occurs for the administrator logged in as a user when performing the ‘Log out from all active connections’ action.</li>
+            <li>Fixed issue when old indexes are not removed when upgrading the Elasticsearch version.</li>
+            <li>Fixed issue when the onlyofficeAutoCleanUp service is not removed after updating to v.12.5.</li>
+            <li>Fixed the "/uploadComplete 500" error when uploading an archive.</li>
+            <li>Fixed issue when the large backup file is not removed from S3.</li>
+            <li>Fixed issue when the PUT /api/2.0/settings/modetheme.json 401 (Unauthorized) error appears in the console when opening a folder via the external link if the dark theme is set in the system.</li>
+            <li>Fixed issue when the size of the created file is added to the statistics of the administrator who performed the backup after performing backup.</li>
+            <li>Fixed issue when the XSS is triggered by a direct link to a malicious SVG file.</li>
+            <li>Updated versions of all related components to the actual ones (nodejs, python, PostgreSQL).</li>
+            <li>Fixed issue when the VC++ 2015 additional packages are not updated for older versions (Windows).</li>
+            <li>Fixed issue with the HTML injection in the Recover Access message (Administrator Message Settings).</li>
+            <li>Reduced the number of characters displayed in the action button title for the parent folder.</li>
+            <li>Fixed the "undefined (reading 'response')" error in the console when opening the Controls section.</li>
+            <li>Fixed issue when the page title does not return to the default value from Common Settings.</li>
+            <li>Fixed issue when the text in the URL bar blends into the background if the portal dark theme is set.</li>
+            <li>Fixed the "/imagescss/quotebord-b.gif 404 (Not Found)" error when quoting a message.</li>
+            <li>Fixed issue when closing / opening a task fails with the following error "Uncaught TypeError: Cannot read properties of null (reading 'unselectable')" onChrome.</li>
+            <li>Fixed the "ASC.Api.Exceptions.ItemNotFoundException (0x80004005): Item not found" error in logs after removing a project.</li>
+            <li>Fixed issue with the XSS via a direct link to the uploaded malicious file on the Wiki page.</li>
+            <li>Fixed issue with the XSS uploaded files in the forum topic.</li>
+            <li>Fixed the "/Images/volume.svg 404 (Not Found" error when opening an audio file.</li>
+            <li>Fixed issue when the Actions button for the parent folder no longer appears after deleting a subfolder via the Actions menu for the parent folder in the ‘Shared with me’ section.</li>
+            <li>Fixed issue with the ‘Sharing settings’ option in the drop-down menu for the parent folder with external access.</li>
+            <li>Fixed issue with the ‘Sharing settings’ option in the drop-down menu for the parent folder for a Guest in the ‘Shared with me’ section.</li>
+            <li>Fixed issue when the Actions menu button on the Participants tab of the main contact disappears after clicking.</li>
+            <li>Fixed issue when the function to reset the application is not displayed in the user profile if his IP address is listed in exceptions.</li>
+            <li>Fixed issue when the .sxc, .et, .ett, .sxi, .dps, .dpt, .sxw, .stw, .wps, .wpt formats are not converted via the manager.</li>
+            <li>Fixed issue when the .sxi format is not supported.</li>
+            <li>Fixed issue when there are no icons for the .sxc, .et, .ett, .sxi, .dps, .dpt, .sxw, .stw, .wps, .wpt formats.</li>
+            <li>Fixed issue when search by folder contents cannot be performed in the ‘Create form template from file’ window.</li>
+            <li>Fixed issue when the ‘Create form template from file’ window does not correspond to layouts.</li>
+            <li>Fixed issue when the authorization page uses the system theme, regardless of the one selected in the profile.</li>
+            <li>Fixed issue with the ‘Delete’ button in the menu of the parent folder for a third-party storage folder.</li>
+            <li>Fixed issue when the files moved from ‘My Documents’ to Google Drive are displayed in the ‘Common’ section in the statistics.</li>
+            <li>Fixed issue when the ‘No files in this folder’ placeholder does not appear after moving all files from a subfolder with external access.</li>
+            <li>Fixed issue when the folder deleted via the parent folder menu appears again on the ‘Shared with me’ page.</li>
+            <li>Fixed issue with the ‘Back’ button in a subfolder with external access via an inherited link.</li>
+            <li>Edited the Twitter functionality description.</li>
+            <li>Fixed the ‘An item with the same key has already been added.’ error when clicking the ‘Common’ folder counter on the user’s portal.</li>
+            <li>Fixed issue when an empty folder with the same name is duplicated when uploading from the local disk using the drag’n’drop method.</li>
+            <li>Fixed the "Index was out of range. Must be non-negative and less than the size of the collection." error in svcIndexer.data.log.</li>
+            <li>Fixed issue when all sessions are not logged out when changing an email by the portal administrator.</li>
+            <li>Fixed issue when the Mail Server data (connected domains and mailboxes) is not saved in the backup.</li>
+            <li>Fixed issue when the disk space quota is displayed in the profile under the user without rights.</li>
+            <li>Fixed issue when it’s possible to create a user on a custom mail domain without setting a password.</li>
+            <li>Fixed issue when the Imap Sync icon wraps to a new line when reducing the browser window (or setting Zoom to 200%).</li>
+            <li>Fixed issue with an incoming event less than 30 minutes long from Google or Outlook comes with the wrong time (-1 hour).</li>
+            <li>Fixed issue when emails from the custom domain are not sent after restoring the portal from SaaS to the server version.</li>
+            <li>Fixed issue when the MX record is not updated after restoring the portal.</li>
+            <li>Updated incorrect links.</li>
+            <li>Fixed issue when the date in the CRM filter is limited to December 2023.</li>
+            <li>Fixed issue when creating a document in a task is performed with the following error: "Uncaught TypeError: Cannot read properties of null (reading 'document')".</li>
+            <li>Fixed issue when the ICS file contains an incorrect PRODID attribute.</li>
+            <li>Fixed issue when backup to Google Cloud fails when enabling Public Access Prevention.</li>
+            <li>Fixed issue with endless loading Portal memory quota.</li>
+            <li>Fixed issue when the user who does not have access to the Community module can download any file from the Wiki.</li>
+            <li>Fixed issue with the black portal logo in the PDF Editor with the light theme.</li>
+            <li>Fixed issue when the /api/2.0/portal/startbackup method allows creating backup in My Documents.</li>
+            <li>Fixed issue when the POST /ajaxpro/ASC.Web.UserControls.Bookmarking.BookmarkingUserControl,ASC.Web.Community.ashx method allows a user who does not have access to the Community module to create a bookmark.</li>
+            <li>Fixed issue when the /api/2.0/security/activeconnections/logout/{loginEventId} method is available to users who do not have administrator rights.</li>
+            <li>Removed/replaced ONLYOFFICE Sample Form (.oform) on the portal.</li>
+            <li>Fixed error when converting XML.</li>
+            <li>Fixed issue with the loader when hovering over the Actions button of the parent folder again after deleting a subfolder via the same menu.</li>
+            <li>Added a new icon for the PDF Editor.</li>
+            <li>Filling out PDF instead of OFORM is now used.</li>
+            <li>Conversion DOCXF to OFORM is no longer supported.</li>
+            <li>Added templates for empty files in ar-SA and sr-Latn-RS.</li>
+            <li>The history when sharing for external users is now available only to authorized users.</li>
+            <li>Closed the functionality for copying text from the editor when the DenyDownload option is set for a file.</li>
+            <li>Fixed the ability to enable recaptcha for the login page. Added the description to the Help Center.</li>
+            <li>Added display of an error in the title of the landing page for an external link to a file when access to it is closed.</li>
+            <li>Edited the birthday page for several birthdays on the same day with long titles.</li>
+            <li>Fixed bugs related to the dark theme.</li>
+            <li>Fixed the bug with the ability to select several answers when voting in a poll with only one choice.</li>
+            <li>Completely removed Twitter from CRM.</li>
+            <li>Fixed the GetByFilter method (the target parameter was not passed into the request).</li>
+            <li>Fixes for compatibility with DocSpace.</li>
+            <li>Fixed the “ArgumentOutOfRangeException: The absolute expiration value must be in the future” error when specified zero blocking time.</li>
+            <li>Added the .mhtml format icon.</li>
+            <li>Added setting focus to the password field.</li>
+        </ul>   
+        <p class="changelog-subheader">Documents module</p>
+        <ul>
+            <li>File formats of the OOXML group (docm dotm dotx potm potx ppsm pptm xlsm xltm xltx) are opened for editing without conversion to docx, xlsx, pptx. They will be available for encryption in Private rooms. Now it’s also possible to share files for commenting – docm dotm dotx potm potx ppsm pptm xlsm xltm xltx, for reviewing – docm dotm dotx, for a custom filter – xlsm xltm xltx.</li>
+            <li>Added opening for new formats: sxc, et, ett, sxi, dps, dpt, sxw, stw, wps, wpt (Docs v7.4 required).</li>
+            <li>Conversion when loading and before opening a non-OOXML format is now performed to the ooxml format (not to docx, xlsx, pptx depending on the type). This way the files will be converted to the format selected by DS. For example, if the doc file contains a macros, it will be converted to docm, not to docx.</li>
+            <li>Users with access for reading are transferred to the editor to be able to specify full access to the protected region in the spreadsheet (Docs v7.4 required).</li>
+            <li>When adding data to a spreadsheet via an external link to another spreadsheet, the update is available from the edited file (Docs v7.5 required).</li>
+            <li>Added the ability to open the editor for an external data source spreadsheet in a new tab if the data is inserted to the spreadsheet via an external link (Docs v7.5 required).</li>
+            <li>Added templates for empty files for si-LK, ar-SA and sr-Latn-RS cultures.</li>
+            <li>Added new formats for generating thumbnails.</li>
+            <li>Added uiTheme in Desktop v7.5 when portal:login (The color of the connected portal tab does not correspond to the interface theme).</li>
+            <li>Generating a form template from a local DOCX file.</li>
+            <li>Added a drop-down list with actions for a parent folder.</li>
+            <li>Added a filter to the fileselector.</li>
+            <li>The pdf format is now considered as fillable one instead of oform.</li>
+            <li>Removed docxf to oform conversion.</li>
+        </ul>    
+        <p class="changelog-subheader">Mail module</p>
+        <ul>
+            <li>Fixed an error in recording auto-reply parameters in email services. Due to this error, a user accidentally did not receive emails if there was an overdue auto-reply.</li>
+            <li>Fixed SQL requests for calculating counters of read messages in folders.</li>
+            <li>Fixed SQL requests for working with emails in custom folders (moving/removing/adding tags).</li>
+            <li>Fixed issue when the Mail Server data (connected domains and mailboxes) is not saved in the backup.</li>
+        </ul>  
+        <p class="changelog-subheader">Control Panel</p>
+        <ul>
+            <li>Added the ability to restrict access rights to the application files for the Others group.</li>
+            <li>Fixed issue with redirect to the portal main page when opening Control Panel after a day on Ubuntu 22.10.</li>
+            <li>Fixed retrieving data error when opening the backup page.</li>
+            <li> Fixed issue when backup with Mail is not performed after disabling and enabling encryption (added text about stopping services and the instruction to the Help Center).</li>
+            <li>Fixed issue when features are not saved to the new tariff when setting a quota for the portal.</li>
+            <li>Edited sources build.</li>
+        </ul>
+    </div>
+</div><div class="changelog-version-block">
     <p class="changelog-main-header">Version 12.5.2</p>
     <p class="changelog-release-date">Release date: <span class="crd-date">05/17/2023</span></p>
     <div class="changelog-switcher">
diff --git a/Web/Controls/Help/Server/ControlPanel/BackupRestore/backup-restore.ascx b/Web/Controls/Help/Server/ControlPanel/BackupRestore/backup-restore.ascx
index 0d02eb777..4e6669e94 100644
--- a/Web/Controls/Help/Server/ControlPanel/BackupRestore/backup-restore.ascx
+++ b/Web/Controls/Help/Server/ControlPanel/BackupRestore/backup-restore.ascx
@@ -123,7 +123,7 @@
 				If you select the <b>Documents module</b> or one of the third-party services connected to it (DropBox, Box.com, OneDrive, Google Drive, Yandex Disk and storages connected via the WebDAV protocol), the backup file size affects the overall disk space used on your portal.
 				</div>
 			</li>
-                <li>check the <b>Include Mail in backup</b> box if you want to backup the <b>Mail</b> data as well. This increases the backup process time and backup file size, but if this option is unchecked, the <b>Mail</b> data will be lost after restoring and you'll need to connect accounts again.
+                <li>check the <b>Include Mail in backup</b> box if you want to backup the <b>Mail</b> data as well. This increases the backup process time and backup file size, but if this option is unchecked, the <b>Mail</b> data will be lost after restoring and you'll need to connect accounts again. Please refer to the <a href="#step2"><b>Backup Mail data</b></a> section to find aditional instructions for Mail.
                 <div class="notehelp nh_notice">
 				The license data will not be included into the backup. After restoring data from the backup, you will need to upload your license file again.
 				</div>
@@ -137,7 +137,48 @@
          </div>
       </div>
 
-    <h2 id="step2">Automatic backup</h2>
+    <h2 id="step2">Backup Mail data</h2>
+    <div class="block_of_step">
+        <div class="screen_text">
+				<p>Perform additional actions to backup the <b>Mail</b> data.</p>
+			</div>				
+			<div class="screen_text">
+                <div class="notehelp">This instruction does not work for Windows version.</div>
+				<ol>
+                    <li>Enter the Community Server container:
+<pre><code>docker exec -it onlyoffice-community-server bash</code></pre>
+                    </li>
+                    <li>Go to the services folder:
+<pre><code>cd /var/www/onlyoffice/Services/TeamLabSvc</code></pre>
+                    </li>
+                    <li>Open the configuration file:
+<pre><code>nano TeamLabSvc.exe.config</code></pre>
+                    </li>
+                    <li>Add settings for access to the host machine:
+<pre><code>&lt;backup&gt;
+  &lt;mailServer pathToMailFilesOnHost="/app/onlyoffice/MailServer/data" hostAddress="127.0.0.1" hostUsername="root" hostKey="/tmp/key.pem" /&gt;
+&lt;/backup&gt;
+</code></pre>
+                        <ul>
+                            <li><b>pathToMailFilesOnHost</b> - the full path to the Mail Server files. For Linux, you can specify the following path: <code>/app/onlyoffice/MailServer/data</code>.<</li>
+                            <li><b>hostAddress</b> - the address of the machine where the Mail Server container is located.</li>
+                            <li><b>hostUsername</b> - the username for connecting to the machine where the Mail Server container is located.</li>
+                            <li><b>hostPassword</b> - the password for connecting to the machine where the Mail Server container is located.</li>
+                            <li><b>hostKey</b> - the path to the file with the user's SSH certificate for connecting to the machine where the Mail Server container is located. The file must be in the OpenSSH format, it can be generated with Putty Key Generator.</li>
+                        </ul>
+                        <div class="notehelp nh_important"><span class="important_notice_label">Important</span>Either <b>hostPassword</b> or <b>hostKey</b> field must be filled in. If both fields are filled in, the connection will be performed using the key first, if unsuccessful, the password will be used.</div>
+                        <div class="notehelp nh_important"><span class="important_notice_label">Important</span>The user (<b>hostUsername</b>) specified in the settings must have rights to read and write the folder with the Mail Server files (<b>pathToMailFilesOnHost</b>). For Linux machines, you can execute the following command: <code>chmod -R 755 /app/onlyoffice/MailServer/data</code>.</div>
+                    </li>
+                    <li>Save the file (Ctrl+S) and exit (Ctrl+X).</li>
+                    <li>Restart the service:
+<pre><code>systemctl restart onlyofficeBackup</code></pre>
+                    </li>
+                    <li>Proceed to the <a href="#step4"><b>Data restore</b></a> section to restore data from the backup file.</li>
+                </ol>
+		</div>
+	</div>
+
+    <h2 id="step3">Automatic backup</h2>
     <div class="block_of_step">
         <div class="screen_text">
 				<p>To automate the backup process, switch to the <b>Backup</b> page in the <b>COMMON SETTINGS</b> section on the left sidebar and use the <b>Automatic backup</b> section:</p>
@@ -160,7 +201,7 @@
 		</div>
 	</div>
 
-    <h2 id="step3">Data restore</h2>
+    <h2 id="step4">Data restore</h2>
     <div class="block_of_step">
 			<div class="screen_text">
                 <div class="notehelp">
diff --git a/Web/Controls/Help/Server/ControlPanel/BackupRestore/backup-restore.ru.ascx b/Web/Controls/Help/Server/ControlPanel/BackupRestore/backup-restore.ru.ascx
index d75c06b5d..928e85f8f 100644
--- a/Web/Controls/Help/Server/ControlPanel/BackupRestore/backup-restore.ru.ascx
+++ b/Web/Controls/Help/Server/ControlPanel/BackupRestore/backup-restore.ru.ascx
@@ -117,7 +117,7 @@
 				При выборе опции <b>Модуль Документы</b> или одного из сторонних сервисов, подключенных к нему (DropBox, Box.com, OneDrive, Google Drive, Yandex Disk, хранилища, подключенные по протоколу WebDAV), размер файла резервной копии влияет на общее занятое дисковое пространство на портале.
 				</div>
 			</li>
-                <li>установите флажок <b>Включить Почту в резервную копию</b>, если вы хотите также выполнить резервное копирование данных <b>Почты</b>. Это увеличит время выполнения резервного копирования и размер файла резервной копии, но, если эта опция отключена, данные модуля <b>Почта</b> будут потеряны после восстановления, и учетные записи придется подключать заново.
+                <li>установите флажок <b>Включить Почту в резервную копию</b>, если вы хотите также выполнить резервное копирование данных <b>Почты</b>. Это увеличит время выполнения резервного копирования и размер файла резервной копии, но, если эта опция отключена, данные модуля <b>Почта</b> будут потеряны после восстановления, и учетные записи придется подключать заново. Пожалуйста, обратитесь к разделу <a href="#step2"><b>Резервное копирование данных Почты</b></a> для получения дополнительных инструкций.
                 <div class="notehelp nh_notice">
 				Данные о лицензии не будут включены в резервную копию. После восстановления данных из резервной копии вам понадобится повторно загрузить файл лицензии.
 				</div>
@@ -128,7 +128,48 @@
          </div>
       </div>
 
-    <h2 id="step2">Автоматическое резервное копирование</h2>
+    <h2 id="step2">Резервное копирование данных Почты</h2>
+    <div class="block_of_step">
+        <div class="screen_text">
+				<p>Выполните дополнительные действия для резервного копирования данных <b>Почты</b>.</p>
+			</div>				
+			<div class="screen_text">
+                <div class="notehelp">Эта инструкция не работает для Windows-версии.</div>
+				<ol>
+                    <li>Войдите в контейнер Community Server:
+<pre><code>docker exec -it onlyoffice-community-server bash</code></pre>
+                    </li>
+                    <li>Перейдите в папку сервисов:
+<pre><code>cd /var/www/onlyoffice/Services/TeamLabSvc</code></pre>
+                    </li>
+                    <li>Откройте файл конфигурации:
+<pre><code>nano TeamLabSvc.exe.config</code></pre>
+                    </li>
+                    <li>Добавьте настройки доступа к хостовой машине:
+<pre><code>&lt;backup&gt;
+  &lt;mailServer pathToMailFilesOnHost="/app/onlyoffice/MailServer/data" hostAddress="127.0.0.1" hostUsername="root" hostKey="/tmp/key.pem" /&gt;
+&lt;/backup&gt;
+</code></pre>
+                        <ul>
+                            <li><b>pathToMailFilesOnHost</b> - полный путь к файлам почтового сервера. Для Linux можно указать следующий путь: <code>/app/onlyoffice/MailServer/data</code>.</li>
+                            <li><b>hostAddress</b> - адрес машины, на которой размещен контейнер почтового сервера.</li>
+                            <li><b>hostUsername</b> - имя пользователя для подключения к машине, на которой размещен контейнер почтового сервера.</li>
+                            <li><b>hostPassword</b> - пароль для подключения к машине, на которой размещен контейнер почтового сервера.</li>
+                            <li><b>hostKey</b> -  путь к файлу с сертификатом SSH пользователя для подключения к машине, на которой размещен контейнер почтового сервера. Файл должен быть в формате OpenSSH, его можно сгенерировать с помощью Putty Key Generator.</li>
+                        </ul>
+                        <div class="notehelp nh_important"><span class="important_notice_label">Важно</span>Должно быть заполнено хотя бы одно из полей: <b>hostPassword</b> или <b>hostKey</b>. Если заполнены оба поля, подключение будет производиться сначала по ключу, при неудаче по паролю.</div>
+                        <div class="notehelp nh_important"><span class="important_notice_label">Важно</span>У пользователя (<b>hostUsername</b>), который указывается в настройках, должны быть права на чтение и запись папки с письмами (<b>pathToMailFilesOnHost</b>). Для Linux можно выполнить следующую команду: <code>chmod -R 755 /app/onlyoffice/MailServer/data</code>.</div>
+                    </li>
+                    <li>Сохраните файл (Ctrl+S) и выйдите (Ctrl+X).</li>
+                    <li>Перезапустите сервис:
+<pre><code>systemctl restart onlyofficeBackup</code></pre>
+                    </li>
+                    <li>Перейдите к разделу <a href="#step4"><b>Восстановление данных</b></a> для восстановления данных из файла резервной копии.</li>
+                </ol>
+		</div>
+	</div>
+
+    <h2 id="step3">Автоматическое резервное копирование</h2>
     <div class="block_of_step">
         <div class="screen_text">
 				<p>Для автоматизации процесса резервного копирования перейдите на страницу <b>Резервное копирование</b> в разделе <b>ОБЩИЕ НАСТРОЙКИ</b> на левой боковой панели и используйте раздел <b>Автоматическое резервное копирование</b>:</p>
@@ -151,7 +192,7 @@
 		</div>
 	</div>
 
-    <h2 id="step3">Восстановление данных</h2>
+    <h2 id="step4">Восстановление данных</h2>
     <div class="block_of_step">
 			<div class="screen_text">
                 <div class="notehelp">
diff --git a/Web/Controls/Help/Server/ControlPanel/CPChangelog.ascx b/Web/Controls/Help/Server/ControlPanel/CPChangelog.ascx
index 3ebf38d86..f36463f6d 100644
--- a/Web/Controls/Help/Server/ControlPanel/CPChangelog.ascx
+++ b/Web/Controls/Help/Server/ControlPanel/CPChangelog.ascx
@@ -1,6 +1,21 @@
 <%@ Control Language="C#" Inherits="BaseContentUserControls" %>
 <%@ Register Namespace="TeamLab.Controls" Assembly="__Code" TagPrefix="cc" %>
 <div class="changelog-open-in-new-window"><a target="_blank" href="<%=VirtualPathUtility.ToAbsolute("~/server/controlpanel/changelog.aspx")%>">Open in new window</a></div>
+<div class="changelog-version-block">
+    <p class="changelog-main-header">Version 3.5.2</p>
+    <p class="changelog-release-date">Release date: <span class="crd-date">02/29/2024</span></p>
+    <div class="changelog-switcher">
+        <p class="changelog-subheader">General</p>
+        <ul>
+            <li>Added the ability to restrict access rights to the application files for the Others group.</li>
+            <li>Fixed issue with redirect to the portal main page when opening Control Panel after a day on Ubuntu 22.10.</li>
+            <li>Fixed retrieving data error when opening the backup page.</li>
+            <li> Fixed issue when backup with Mail is not performed after disabling and enabling encryption (added text about stopping services and the instruction to the Help Center).</li>
+            <li>Fixed issue when features are not saved to the new tariff when setting a quota for the portal.</li>
+            <li>Edited sources build.</li>
+        </ul>
+    </div>
+</div>
 <div class="changelog-version-block">
     <p class="changelog-main-header">Version 3.5</p>
     <p class="changelog-release-date">Release date: <span class="crd-date">03/14/2023</span></p>
diff --git a/Web/Controls/Help/VariousControls/Versions/CommunityServer/CommunityServerDocker_Current.ascx b/Web/Controls/Help/VariousControls/Versions/CommunityServer/CommunityServerDocker_Current.ascx
index 93addac47..3d0c344f3 100644
--- a/Web/Controls/Help/VariousControls/Versions/CommunityServer/CommunityServerDocker_Current.ascx
+++ b/Web/Controls/Help/VariousControls/Versions/CommunityServer/CommunityServerDocker_Current.ascx
@@ -1,4 +1,4 @@
 <%@ Control Language="C#" Inherits="BaseContentUserControls" %>
 <%@ Register Namespace="TeamLab.Controls" Assembly="__Code" TagPrefix="cc" %>
-<a class="page_version_link" target="_blank" href="https://github.com/ONLYOFFICE/Docker-CommunityServer"><span class="pvl_product">ONLYOFFICE Groups</span><span class="pvl_version pvl_current">v12.5.2</span></a>
+<a class="page_version_link" target="_blank" href="https://github.com/ONLYOFFICE/Docker-CommunityServer"><span class="pvl_product">ONLYOFFICE Groups</span><span class="pvl_version pvl_current">v12.6.0</span></a>
 <cc:LocalizeContent runat="Server" ControlName="~/Controls/Help/VariousControls/Changelogs/CommunityServerChangelog.ascx" />
diff --git a/Web/Controls/Help/VariousControls/Versions/CommunityServer/CommunityServerWindows_Current.ascx b/Web/Controls/Help/VariousControls/Versions/CommunityServer/CommunityServerWindows_Current.ascx
index fa7423225..b3e9bee4e 100644
--- a/Web/Controls/Help/VariousControls/Versions/CommunityServer/CommunityServerWindows_Current.ascx
+++ b/Web/Controls/Help/VariousControls/Versions/CommunityServer/CommunityServerWindows_Current.ascx
@@ -1,3 +1,3 @@
 <%@ Control Language="C#" Inherits="BaseContentUserControls" %>
 <%@ Register Namespace="TeamLab.Controls" Assembly="__Code" TagPrefix="cc" %>
-<a class="page_version_link" target="_blank" href="https://sourceforge.net/projects/teamlab/files/ONLYOFFICE_CommunityServer/"><span class="pvl_product">ONLYOFFICE Groups</span><span class="pvl_version pvl_current">v12.5.2</span></a>
\ No newline at end of file
+<a class="page_version_link" target="_blank" href="https://sourceforge.net/projects/teamlab/files/ONLYOFFICE_CommunityServer/"><span class="pvl_product">ONLYOFFICE Groups</span><span class="pvl_version pvl_current">v12.6.0</span></a>
\ No newline at end of file
diff --git a/Web/Controls/Help/VariousControls/Versions/CommunityServer/CommunityServer_Current.ascx b/Web/Controls/Help/VariousControls/Versions/CommunityServer/CommunityServer_Current.ascx
index ee5090d98..91d8d7757 100644
--- a/Web/Controls/Help/VariousControls/Versions/CommunityServer/CommunityServer_Current.ascx
+++ b/Web/Controls/Help/VariousControls/Versions/CommunityServer/CommunityServer_Current.ascx
@@ -3,5 +3,5 @@
 <%@ Register TagPrefix="cc" TagName="CommSerChangelog" Src="~/Controls/Help/VariousControls/Changelogs/CommunityServerChangelog.ascx" %>
 <a class="page_version_link" target="_blank" href="https://github.com/ONLYOFFICE/CommunityServer/">
     <span class="pvl_product">ONLYOFFICE Groups</span>
-    <span class="pvl_version pvl_current">v12.5.2</span></a>
+    <span class="pvl_version pvl_current">v12.6.0</span></a>
 <cc:CommSerChangelog ID="CommSerChangelog1" runat="server" />
diff --git a/Web/images/Help/Guides/big/guide121/forms.png b/Web/images/Help/Guides/big/guide121/forms.png
index 491b3ce78..5b6c13f77 100644
Binary files a/Web/images/Help/Guides/big/guide121/forms.png and b/Web/images/Help/Guides/big/guide121/forms.png differ
diff --git a/Web/images/Help/Guides/small/guide121/forms.png b/Web/images/Help/Guides/small/guide121/forms.png
index c76821be4..6e60b7a56 100644
Binary files a/Web/images/Help/Guides/small/guide121/forms.png and b/Web/images/Help/Guides/small/guide121/forms.png differ