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If you can sync your email when the firewall is turned off, you'll need to allow the Mail and Calendar apps through the firewall. Windows Defender Security Center is free security software that's included with Windows 10. If you haven't installed alternative security software, you should temporarily turn off Windows Defender Security Center. Test other Troubleshoot Office 365 Sync and Login Issues programs or websites to be sure Outlook is the only problem.
Method 4: Recreating the Outlook Profile
If two-factor authentication is turned on for your account, you'll need to create an app password for that account. An app password is used instead of your normal account password for apps Fix Outlook Not Opening After Windows Update that don't support two-factor authentication. Before you begin, make sure that your device has the latest operating system and app updates. Try the general troubleshooting solutions in Troubleshooting Mail and Calendar apps for Windows 10. Once you have completed the steps to fix Outlook sync errors, kindly check if the error has been fixed or not.
Check the connectivity to your email server
We have shared five manual methods in this blog to resolve the Outlook syncing errors.The client has a computer off the domain at home that his work email is tied to and he has never had any of these issues in Cache mode with that device.Once the client started using Outlook again after some time has passed the issue had come back.When they go back to the message and press send they get an error that the message has been deleted.After these instructions, ensure the sync settings are correct and check everything is working well.
You'll also receive a mail (to the alternate email and to your admin email) from Microsoft Office 365 sync problems and login fixes 365 that indicates your tenant has encountered directory synchronization errors. For details see Identify directory synchronization errors in Microsoft 365. I still have it turned on on my laptop and it has not shown any issues yet.
Methods to fix Microsoft Outlook syncing error
To solve your Outlook issues, download the application from the Microsoft website and follow the directions. If I check the sync log I see a lot of sync errors for Inbox, sent items and a few other folders. The most common cause of an out-of-date account is an incorrect password. In the notification bar at the top of the app, select Fix account. If your password is incorrect, you'll see a message asking you to update your password.
Microsoft Outlook Sync issues
I’ve tried the Microsoft office uninstall tool provided by Microsoft (which deletes more items then just control panel uninstall). Below are the steps I’ve taken to try to resolve this issue. Two-factor authentication helps protect your account by making it more difficult for someone else to sign in. It verifies your identity using your password and a contact method (also known as security info). Outlook will show as connected to Exchange but is not receiving any new email. This can happen for days at a time, and then disappear for a day or 2, only to appear again.