If you see any error message similar to the following, the synchronization is not working properly. Remember, the repair process may take some time, especially for accounts with large amounts of data. Check with your email provider for instructions about how to create an app password for your email account. 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. 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.

The reason is that if the Calendar that is not syncing is not an Outlook calendar, it takes up to 24 hours for events to be reflected in Outlook. If you have less than 5GB of free storage, please make sure to delete unnecessary data, images, videos, or apps you no longer use. Even though this is not common as iPhones and iPads generally have lots of memory, if you’re running low on storage, chances are that new events won’t show up in your calendar. Regardless of the type of calendar provider you’ve connected to Google Calendar (Outlook, iCloud, or another Google Calendar), the first step is to remove it from Google Calendar. To do so, follow the same steps as the "Manually sync Google Calendar to Outlook" section above.

Solution 5: Clear RoamCache Files

If you’re using an IMAP or POP account, some of these options may not be available, and you might need to check your account-specific sync settings. It’s worth noting that sometimes, what appears to be a sync issue might actually be a delay. Outlook doesn’t always sync instantaneously, and there can be a short lag between changes made and their appearance across all devices. The most common cause of an out-of-date account is an incorrect password. If your password is incorrect, you'll see a message asking you to update your password. If you still can't sync your email after removing your account and adding it again, you might need to add the account using advanced setup.

This section will guide you through a series of troubleshooting steps to get your calendar back on track, whether you’re using Outlook on your desktop or mobile device.We're on O365, most users are on the monthly enterprise channel (version 2404) with a couple early adopters on the Current channel.The Virto Calendar App for Microsoft 365 & Microsoft Teams is a powerful calendar management solution designed to enhance team collaboration and streamline scheduling processes.Below are the common reasons behind the shared calendar synchronization issues.In Outlook, shared calendars allow multiple users to access and update a calendar, schedule events and ensure everyone stays on the same page.Shared calendars in Outlook are a powerful tool for team collaboration, but they can sometimes encounter sync issues.Users with "Delegate" permissions are seeing all updates in real-time.If this doesn’t work, the only way to make it work is to use a third-party calendar automation tool like OneCal.

Troubleshooting sync issues on mobile devices

Why do I keep getting a sync error on my calendar?

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 How to fix email not syncing included with Windows 10. If you haven't installed alternative security software, you should temporarily turn off Windows Defender Security Center.

Additional resources

If none of the steps above work, the last resort is to delete all Outlook Calendar data. This will delete all your Outlook Calendar data, including login details, preferences, and settings. Please note that the exact wording and layout can vary depending on your device's make, model, and Android version, but these steps should guide you in the right direction.

Solutions to Fix the Shared Calendar not Syncing issue with Outlook

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.

NEWS & EVENTS

If your primary Outlook Calendar account is not syncing, you can try to remove the account from your device, and add it again. Google Calendar not syncing with Outlook is not fixable by switching any settings in Google Calendar or Outlook. The only way to fix Google Calendar not syncing with Outlook Calendar is through the use of a Calendar Sync tool. Calendar Sync Tools use the official Outlook and Google Calendar API to automatically sync calendars. If your Outlook Calendar suddenly stopped syncing, you need to read this article. Let’s go over how to fix Outlook Calendar not syncing, so your schedule is synced across all your calendars.

Solution 6: Clear Offline Items and Verify Calendar Sharing Settings

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.