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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 login issue guide programs or websites to be sure Outlook is the only problem.

Method 4: Recreating the Outlook Profile

Here, we will discuss the disable faulty add-ins in Outlook five manual methods to fix sync issues in Outlook or OWA. Before finding solutions, we suggest that users check their internet connection. Sometimes, Outlook sync issues can arise because of poor internet connection. If you are still facing this issue, kindly follow the solutions below to fix the sync issues in Outlook. Firewalls and antivirus software might prevent you from syncing your email and calendar events.

Check the connectivity to your email server

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.If it does, you might need to include Outlook exceptions in the settings of your security program.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.Always make sure your profile and settings are set up correctly, your software is up to date, and your connection is steady.

You'll also receive a mail (to the alternate email and to your admin email) from Microsoft repair corrupted OST in Outlook 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

To make sure there are no issues, click Test Account Settings to test the connection. It is possible for a corrupted Outlook profile to impede synchronization. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. If the problems do not occur in safe mode, its most likely an add-in causing grief. I’ve been in contact with Microsoft they had me migrate his account\data to another server this did not fix it.