ActiveSync broken by Windows update..
Since last weekend, Support received a few reports from users who saw problems with Outlook ActiveSync synchronization towards Kolab Now. No emails were synchronized to their inbox, and the content of the Outlook Inbox would not match the inbox in the Kolab Webclient.
After some investigation it was realized, that Microsoft had provided (and automatically deployed) a new update on February 1st, and that this update caused the faulty behavior. The new version was: 2401 (various build numbers).
Rolling back Outlook resolved the issue for all users and brought back the normal behavior, and outlook would again synchronize email to the inbox.
A short version of the downgrade procedure is:
- Find the version to downgrade to at the Microsoft site.
- Disable automatic updates via Start -> Settings -> Windows Updates
- Close down Outlook.
- Open an admin shell.
- Run: C:\Program Files\Common Files\microsoft shared\ClickToRun\OfficeC2RClient.exe /update user updatetoversion=16.0.17029.20108
- (change 16.0.17029.20108 if you want to roll back to an even older version).
- Start Outlook again.
Please seek further information about rollback of outlook versions at the Microsoft support site.
2024-02-23 – Update: We had a few users asking when we will have a fix for this issue. To that we must refer to the Microsoft support article about the issue, which can be found here. In short they lightly suggest, that the patch will be released on 1st of April (We do not think that this is an April Fool’s joke ).