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The other solution to fix Outlook sync issues is recreating Microsoft Outlook profile. Follow each step carefully to resolve synchronization errors. Sometimes an error appears in the Mail and Calendar apps when Outlook data file cannot be accessed the apps try to sync new email or calendar events. We’ve had sync issues with employees from time to time however, re doing the mail profile or wiping the Windows profile usually fixes it.
Method 4: Recreating the Outlook Profile
However once I joined this computer back to the domain and let it sit for a few days it was also working fine. Once the client started using Outlook again after some time has passed the issue had come back. I’ve tried to set cache mode from 1 year all the way down to a few days. If your password isn't the problem, you might have a certificate error. If so, you'll see a message that says, "There is a problem with the server's security certificate. The security certificate Exchange connectivity diagnostic is not from a trusted certifying authority."
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.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.The other solution to fix Outlook sync issues is recreating Microsoft Outlook profile.
You'll also receive a mail (to the alternate email and to your admin email) from Microsoft expert Outlook tips by FixTechGuide 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 size of your .ost file is close to the limit, you could try increasing the limit on your client, restart Outlook and see if there is any difference. If you're using an Outlook.com, Microsoft 365, or Exchange account, you won't have advanced mailbox settings unless the account was set up using advanced setup. 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. I’ve unchecked download shared folders when setting up a new Outlook profile. Check with your email provider for instructions about how to create an app password for your email account. The Mail and Calendar apps for Windows 10 don't support two-factor authentication.
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.