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by Rena Petro on October 8, 2025

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If the synchronization starts working, you can remove the old profile from Outlook. By repairing or reinstalling MS Office, you can fix any issue with the Outlook program files that might be damaged, leading to the synchronization issues in the Outlook program. Check if the shared calendar is now syncing properly with Outlook.

Solution 8: Repair or Reinstall Outlook (MS Office)

Why is my Outlook calendar not showing events? <br><br>

Outlook calendar syncing problems, while frustrating, are usually fixable. Common culprits include incorrect permissions, network or server issues, outdated software, cached data conflicts, and account misconfigurations. Also, be mindful of potential conflicts when multiple users edit shared calendars.

Create an Email Group in Outlook for Faster Team Communication

In fact, calendar synchronization problems are among the most frequently reported issues <a href="https://woundcaregurus.com/office-365-troubleshooting-issues-common-problems-and-how-to-solve-them-2/">Fix email login issues quickly</a> by Outlook users. These sync hiccups can stem from various sources, including network connectivity problems, outdated software, or conflicts between different calendar services. Third-party firewalls or antivirus software might prevent you from syncing your email and calendar events.

Check your security software

In the following sections, we’ll dive into specific solutions to get your Outlook calendar syncing smoothly again. The Virto Calendar App for Microsoft 365 & Microsoft Teams is a powerful calendar management solution designed to enhance team collaboration and streamline scheduling processes. This app bridges the gap between various Microsoft 365 apps, providing a seamless calendar syncing experience that significantly improves team planning and coordination.

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If so, you'll see a message that says, "There is a problem with the server's security certificate. The security certificate is not from a trusted certifying authority." Check with your email provider for instructions about how to create an app password for your email account. We're sorry you're having problems with the Mail and Calendar apps for Windows 10. To fix the issue, please try each of the following solutions in order. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.

These sync hiccups can stem from various sources, including network connectivity problems, outdated software, or conflicts between different calendar services.Another frequent culprit is outdated software and caching problems.The current MS fix is - remove the calendar from Outlook (on the web) and readd them… they are presently not suggesting that I change any permissions.However, they should be approached with caution, especially in managed business environments.Third-party firewalls or antivirus software might prevent you from syncing your email and calendar events.If your password is incorrect, you'll see a message asking you to update your password.On restarting, Outlook should download and synchronize all mail items, and you should see the updated shared calendar.Further, you can check the Sync Issues folder in the Outlook navigation pane to find the reason behind the calendar synchronization issue.

Check the software documentation to learn how to temporarily turn it off. Firewalls and antivirus software might prevent you from syncing your email and calendar events. Below are the solutions you can follow to troubleshoot or fix the shared calendar syncing problem with Outlook. Sometimes an error appears in the Mail and Calendar apps when the apps try to sync new email or calendar events.

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