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Agree with Bobby le Marconiste, if you still suffer the issue, here are some suggestions you may refer to:
- Re-add Your Account: Remove and then re-add your email account.
- Update Outlook: Make sure you have the latest updates installed.
- Rebuild the OST file: Close New Outlook and locate C:\Users<username>\AppData\Local\Microsoft\Outlook, rename the folder, and then restart the New Outlook. More information: Synchronization issues between Outlook and Outlook Web App - Outlook | Microsoft Learn
Hope it helps!
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