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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 clear Outlook credentials manager 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 FixTechGuide Windows update Outlook fix is not from a trusted certifying authority."

Check the connectivity to your email server

You'll also receive a mail (to the alternate email and to your admin email) from Microsoft 365 that indicates your tenant has encountered directory synchronization errors.It is possible for a corrupted Outlook profile to impede synchronization.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.Try the general troubleshooting solutions in Troubleshooting Mail and Calendar apps for Windows 10.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.

When the user is signed into their mobile app, webmail, or the recreate Outlook profile step by step Windows Mail app, they are able to receive email perfectly fine with those. The issue is occurring only in the Outlook program installed on Windows. To update from Azure AD Sync to Microsoft Entra Connect, see the upgrade instructions.

Methods to fix Microsoft Outlook syncing error

In some cases setting up a new computer replacement was the only option to fix these odd Outlook Sync issues. Outlook’s ability to connect to the mail server may be blocked by firewalls or antivirus software. After you’re satisfied, turn off your firewall or antivirus program for a while. If it does, you might need to include Outlook exceptions in the settings of your security program. Users can also convert OST files into various file formats, including PST, HTML, EML, MSG, vCard, etc.

Microsoft Outlook Sync issues

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. This software allows users to process numerous OST files at once without any size limitations. Moreover, it maintains the folder hierarchy and metaproperties of the data when processing Outlook data files.