UPDATE 9/12:
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New Microsoft 365 Current Channel v2308 build 16731.20234 - Sept. 12
Version 2308 (Build 16731.20234) Security updates listed here Resolved issues Outlook We fixed an issue where an out-of-memory error would appear when sending email after seeing the WaitOnSend dialog pop up. We fixed an issue where the External Sender tag was not showing. We fixed an issue...

Version 2308 (Build 16731.20170)
Feature updates
Excel
- Data Validation dropdown list autocomplete: Dropdown lists are a handy way to make data entry and validation more efficient in Excel. We’ve now added AutoComplete functionality, which automatically compares the text typed in a cell to all items in the dropdown list and displays only the items that match. You’ll spend less time scrolling through lists, dealing with data validation errors, or writing complex code to handle this task.
See details in blog post- Paste values directly into your workbook using a keyboard shortcut: The keyboard shortcut CTRL+SHIFT+V lets you quickly Paste Values rather than having to choose Paste Values from the menu.
See details in blog post- Updated encryption for Microsoft Purview Information Protection: Advanced Encryption Standard (AES) with 256-bit key length in Cipher Block Chaining mode (AES256-CBC) is now the default Microsoft Purview Information Protection encryption mechanism for Microsoft 365 Apps documents and emails. Learn more.
Outlook
- Updated encryption for Microsoft Purview Information Protection: Advanced Encryption Standard (AES) with 256-bit key length in Cipher Block Chaining mode (AES256-CBC) is now the default Microsoft Purview Information Protection encryption mechanism for Microsoft 365 Apps documents and emails. Learn more.
PowerPoint
- Updated encryption for Microsoft Purview Information Protection: Advanced Encryption Standard (AES) with 256-bit key length in Cipher Block Chaining mode (AES256-CBC) is now the default Microsoft Purview Information Protection encryption mechanism for Microsoft 365 Apps documents and emails. Learn more.
Word
- Updated encryption for Microsoft Purview Information Protection: Advanced Encryption Standard (AES) with 256-bit key length in Cipher Block Chaining mode (AES256-CBC) is now the default Microsoft Purview Information Protection encryption mechanism for Microsoft 365 Apps documents and emails. Learn more.
Resolved issues
Outlook
- We fixed an error that users were hitting when they tried to override a Policy Tip detection or to report it as a false positive.
- We fixed an issue that caused Outlook to exit unexpectedly when users executed a search with the "All Mailboxes" scope.
- We fixed an issue that caused the application to close unexpectedly when clicking on non-HTTP links.
- We fixed an issue that caused the incorrect workdays to be displayed on shared-in calendars.
Source:

Latest Office and Microsoft 365 Updates for Windows
https://www.tenforums.com/windows-10-news/217660-office-microsoft-365-support-windows-10-ends-october-14-2025-a.html Latest Office and Microsoft 365 Insider Updates Get the latest Insider build | Office Insider Release Notes for Beta Channel - Office release notes Release Notes Current...

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