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The Mail and Calendar apps for Windows 10 don't support two-factor authentication. If two-factor authentication is turned on for your account, you'll need to create an app password for that account. An app password is used instead of your normal account password for apps that don't support two-factor authentication. You can sign up for a 14-day free trial, no credit card required, to sync your calendars and streamline your availability across all devices. In most cases, the only way to fix Outlook Calendar not syncing is to use a third-party Calendar Sync Tool like OneCal.

You should use the Outlook web app (explained above) to reconnect the calendars in Outlook Calendar. To manually sync a Google Calendar from Outlook, you should first remove it from Outlook. The downside of this method is that it takes up to 24 hours for events created or updated in Google Calendar to be reflected in Outlook. The second method of fixing Google Calendar not syncing with Outlook is to manually sync Google Calendar to Outlook by exporting the Google Calendar and importing it into Outlook.

Additional troubleshooting tips for ‘why won’t my Outlook calendar sync?’

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 Common culprits include incorrect permissions, network or server issues, outdated software, cached data conflicts, and account misconfigurations.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.

• If the shared calendar is syncing, then find and remove the faulty add-in to fix the issue permanently.
• Windows Defender Security Center is free security software that's included with Windows 10.
• In this section, we’ll explore how the Virto Calendar App for Microsoft 365 and Microsoft Teams can take your calendar management to the next level.
• If problems persist, consider reaching out to Microsoft Support or your organization’s IT department for more advanced troubleshooting.
• By leveraging these features, teams can significantly reduce the occurrence of sync issues and improve overall calendar management efficiency.

Guides & How To

It verifies your identity using your password and a contact method (also known as security info). Windows Defender Security Center is free security software that's FixTechGuide troubleshooting blog included with Windows 10. If you haven't installed alternative security software, you should temporarily turn off Windows Defender Security Center.

Remove your account and add it again using advanced setup

Try removing and re-adding the problematic calendar to reset the connection. If none of these steps work, consider clearing your Outlook cache or running the calendar repair tool to fix any underlying data issues. Outlook calendar synchronization ensures that your schedule remains up-to-date across all your devices and platforms. Unfortunately, sync issues are more common than one might expect, leading to missed appointments, scheduling conflicts, and unnecessary stress.

Troubleshoot calendar and contacts in the Outlook mobile app

A problematic OST file can also cause shared calendar synchronization problems. This happens because an inconsistent OST file fails to save the calendar data properly. On restarting, Outlook should download and synchronize all mail items, and you should see the updated shared calendar.





To permanently fix this issue, a third-party calendar sync tool is needed. Where I work we have an issue with the synchronization of Outlook’s shared calendars. Accumulated cache and temporary files can interfere with the Outlook synchronization process and lead to sync errors and issues. These advanced troubleshooting steps can often resolve persistent issues that simpler methods can’t fix. However, they should be approached with caution, especially in managed business environments.

Resolve sync issues in Mail and Calendar apps in Windows 10

Advancing your awareness of Microsoft 365 backup mechanisms can provide supplementary safeguarding for essential data and ensure its retrieval in the future. In the Send/Receive Settings – All Accounts window, ensure that the Calendar checkbox is checked. We're on O365, most users are on the monthly enterprise channel (version 2404) with a couple early adopters on the Current channel.