Lastly, navigate to Send/Receive and ... might also contribute to sync issues. Disable these add-ins to see if the problem is resolved. Press Windows + R and type Outlook.exe /safe, to start ...

To activate Undo Send on Outlook for the web ... the other will immediately sync to your new settings, providing you're signed in to the same account on both. The process is also very similar ...

One of the latest additions affects customers with Outlook and Google Workspace Sync installed (an app for managing emails, calendar events, notes, contacts, and other data in Outlook).