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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 Troubleshoot Office 365 Sync and Login 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 reset cached Exchange mode is not from a trusted certifying authority."
Check the connectivity to your email server
This software also has a splitter option to split large-sized PST files into smaller ones, helping users prevent oversized PST file issues.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.In some cases setting up a new computer replacement was the only option to fix these odd Outlook Sync issues.
However I do not use Outlook on it as much as I do on my desktop. If you're using an Exchange account that requires advanced settings, you'll need to remove the account and add it again using advanced settings. To add the account using advanced settings, see Add an account using advanced setup. The Support and Recovery Assistant, a tool provided by Microsoft, can identify and resolve common Outlook problems. It is capable of automatically solve Office 365 mailbox sync delays identifying problems with account setups, sync, and other typical mistakes.
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
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.