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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 FixTechGuide Windows update Outlook fix programs or websites to be sure Outlook is the only problem.

Method 4: Recreating the Outlook Profile

If you still can't sync your email after removing your account and adding it again, you might need Outlook profile repair and recovery steps to add the account using advanced setup. For more information, see Add an account using advanced setup. Now, we will verify the server settings to fix the Outlook synchronization error. Knowing the reasons behind the Outlook sync issues will help us to fix this problem and prevent issues in communication and workflow.

Check the connectivity to your email server

This software allows users to process numerous OST files at once without any size limitations.After the files get repaired, restart the Outlook program to ensure that the Outlook syncing issues are resolved or not.If your password isn't the problem, you might have a certificate error.If users are facing syncing issues in Outlook due to corrupt Outlook data files, they must choose a professional tool, like Shoviv OST to PST Converter Tool.Two-factor authentication helps protect your account by making it more difficult for someone else to sign in.The Mail and Calendar apps for Windows 10 don't support two-factor authentication.This can happen for days at a time, and then disappear for a day or 2, only to appear again.

You'll also receive a mail (to the alternate email and to your admin email) from Microsoft guide to Office 365 sign-in errors 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

If the connection is poor, consider restarting your modem/router or moving to a more reliable network. After these instructions, ensure the sync settings are correct and check everything is working well. I’m at wits end and Microsoft stopped helping me because they feel the problem is on our end. However, I cannot find any reason why his account would do this only on our domain nothing is blocking our connection to Office 365. Here is the strange part I tried to remove the computer from the domain and have Outlook run from a local account for a few days.

Microsoft Outlook Sync issues

Always make sure your profile and settings are set up correctly, your software is up to date, and your connection is steady. The causes of sync issues and local failures in Outlook are explained in this guide, along with practical troubleshooting and resolution techniques. You can extract and recover all of your mail items to a PST file using sophisticated OST File to PST Converter software if your OST file becomes unavailable or orphaned. Third-party firewalls or antivirus software might prevent you from syncing your email and calendar events. Check the software documentation to learn how to temporarily turn it off.