Outlook 2016 stopped updating cause

There are a few ways to resolve the issue: One option is to remove the recent update that has been pushed out by Microsoft to Outlook 2013 and Office 365 users.

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Anand Khanse is the Admin of The Windows Club.com, a 10-year Microsoft MVP Awardee in Windows (2006-16) & a Windows Insider MVP.

Please read the entire post & the comments first, create a System Restore Point before making any changes to your system & be careful about any 3rd-party offers while installing freeware.

It has come to our attention that many Outlook 2013 and Office 365 users are having issues within synchronizing IMAP folders recently.

1] Run Microsoft Outlook in Safe Mode, without add-ins.

To do this, open Run box from the Win X Menu, type and hit Enter.