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

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 repair corrupted OST in Outlook is not from a trusted certifying authority."

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.When the user is signed into their mobile app, webmail, or the Windows Mail app, they are able to receive email perfectly fine with those.An app password is used instead of your normal account password for apps that don't support two-factor authentication.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.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 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

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.