Microsoft Microsoft 365 Apps Monthly Enterprise Channel Update Version Version 2602 (Build 19725.20170)

Version 2602 (Build 19725.20170) adds Copilot Chat and Excel Agent Mode support for local Excel files, plus Agent mode in Word. It also includes security updates and fixes for OneNote crashes and Outlook calendar character rendering.

• Fixed OneNote crashes when pasting content from a web page containing a <math> (MathML) tag with no attributes.
• Fixed OneNote unexpected closure on startup.
• Updated how Word, Excel, and PowerPoint retrieve configuration information so People experiences work properly in Sovereign cloud environments.
• Fixed Outlook calendar rendering of extended characters that could appear as question marks.

• Excel: Added Copilot Chat support for modern workbooks stored locally on the device.
• Excel: Added Agent Mode support for modern workbooks stored locally on the device.
• Word: Added Agent mode with conversational chat for drafting, rewriting, and refining document content.

• Security updates are listed on the Microsoft 365 Apps security updates page.
• Version 2602 is identified as Build 19725.20170.

• Microsoft 365 Apps security updates
  https://learn.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates

Product Information

Vendor: Microsoft

Product: Microsoft 365 Apps

Product type: Other

Platform: Windows

Variant: Monthly Enterprise Channel

Version: Version 2602 (Build 19725.20170)

Vendor release date: Mar 10, 2026

Original release notes: View on vendor site

Published on updatealert.io: Jun 4, 2026

Description: Office productivity applications for business communication and document work.