This is a general bug that’s been affecting Outlook 2016 and Office 365 for a few days now. As a matter of fact, the first reports date back from January 7th: The good news is that Microsoft has officially acknowledged the problem:
Possible workarounds
Method 1: Use a clean view mode
As a temporary workaround, you can open Outlook in a clean view mode. This quick action may solve your problem. Here’s how to do that: If the problem persists, you can launch Outlook in safe mode to eliminate third-party software and driver incompatibility problems.
Method 2: Tweak the Registry
Let us know if these two quick workarounds solved the problem. Still, if nothing works, you can roll back to Outlook 2013. Here is a full guide to see how.
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