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Last Updated: February 8, 2024

ISSUE

After updating to Version 2401 Build 17231.20182 Outlook stops connecting when using the Exchange ActiveSync (EAS) protocol.

STATUS: INVESTIGATING

The Outlook Team is investigating this issue. We will update this topic when the fix status is available.  

If you need to work around the issue you can revert to a build before the issue started or switch to an Office Channel that does not have the issue.

Workaround:

Revert the Office M365 Click-to-Run installation to Version 2312 Build 17126.20132. 

To do this:

  1. Exit all Office applications.

  2. Select Start, type cmd in the Search box, right-click Command Prompt (or cmd.exe), and then select Run as administrator.

  3. In the command prompt dialog window, type the following two command lines, pressing Enter after each command line:

    cd %programfiles%\Common Files\Microsoft Shared\ClickToRun
    officec2rclient.exe /update user updatetoversion=16.0.17126.20132

  4. When the repair is done, open Outlook and select File > Office Account.

  5. Select Update Options and choose Disable Updates.

  6. Add an appointment on your calendar for a future date April 1, 2024, to check back to this topic to confirm the issue is fixed. If it is, re-enable updates by selecting File > Office Account > Update Options > Enable Updates.

Additional Resources

Change the Microsoft 365 Apps update channel for devices in your organization

How to revert to an earlier version of Office

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See Also

Fixes or workarounds for recent issues in Outlook for PC

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