Microsoft 365 Insider:
Version 2503 (Build 18623.20156)
- Various bug and performance fixes.
Feature updates
Excel
- PDF tagging updates on Excel for Windows: Updating and reducing the accessibility tags added when a workbook is converted to a PDF.
PowerPoint
- Email Notification Context Previews for Files Protected with Microsoft Purview: Notification emails for mentions, tasks, comments, and replies will now contain context previews even when the source document is encrypted, and the email will inherit the document's security policies.
Source:
- Release Notes Current Channel (Preview) - Office release notes
- Update History for Office Current Channel (Preview) - Office release notes

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...
