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Troubleshooting Outlook sync problems

Shared calendars in Outlook are a powerful tool for team collaboration, but they can sometimes encounter sync issues. Understanding why these problems occur is the first step in resolving them. While Outlook’s calendar sync usually works seamlessly across devices, mobile platforms can sometimes present unique challenges. In this section, we’ll explore common troubleshooting sync steps specific to smartphones and tablets, covering both iOS and Android devices.

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  • When synchronization issues occur in Microsoft Outlook or in Microsoft Outlook Web App (formerly Outlook Web Access), you may experience the following symptoms.
  • It can be time-consuming but is sometimes necessary to resolve persistent issues.
  • Common culprits include incorrect permissions, network or server issues, outdated software, cached data conflicts, and account misconfigurations.
  • By leveraging these features, teams can significantly reduce the occurrence of sync issues and improve overall calendar management efficiency.
  • If your password isn't the problem, you might have a certificate error.
  • If these methods do not resolve the issue, we recommend that you rebuild the .ost file.
  • Calendar syncing plays a pivotal role in maintaining an organized and efficient schedule.


The Inbox Repair tool scans the .ost or .pst file and makes sure that the file structure is intact. The tool also tries to repair the internal data structures, if it is necessary. You can experience sync issues in Outlook due to poor or no network connectivity. So, first check if your internet connection is stable and working properly.

Method 15: Recreate Outlook Data File (OST)



Troubleshooting Outlook sync problems

Check your send/receive settings to make sure Outlook is set to update frequently enough. Verify that you’re not in offline mode and that your internet connection is stable. If you’re using a shared calendar, ask the owner to re-share it with you, as sometimes permissions can become corrupted. 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. Often, the root cause lies in incorrect sharing permissions, where users might not have the appropriate access levels to view or edit calendar entries.

Check your privacy settings



How do I reset Outlook sync?



Remember, the repair process may take some time, especially for accounts with large amounts of data. To view the scan log, start Outlook, and then open the Deleted Items folder. Any problems are noted in a message that has "OST Integrity Check" as its Subject. Use the OST Integrity Check Tool (Scanost.exe) to check your .ost file for inconsistencies. When these symptoms occur, or you have other problems synchronizing, the problem might be a corrupted .ost file.

Troubleshooting Outlook sync problems

How to Resolve Sync Issues in Outlook – A Detailed Guide



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 Microsoft support alternatives environments. When your Outlook calendar isn’t syncing properly, it can throw your entire schedule into disarray. 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. 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.

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. For both systems, after making changes, restart Outlook to ensure the new settings take effect. 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. 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. Calendar syncing plays a pivotal role in maintaining an organized and efficient schedule. Whether you’re managing personal appointments or coordinating team meetings, a synchronized calendar ensures that everyone is on the same page, literally and figuratively.

How do I fix Outlook calendar sync issues? & How do I force Outlook calendar to sync?





Outlook doesn’t always sync instantaneously, and there can be a short lag between changes made and their appearance across all devices. If these methods do not resolve the issue, we recommend that you rebuild the .ost file. To do this, delete the .ost file, and then let Outlook download the information again from Exchange Server. For more information, see the More information section of this article. You can check the error message to find the cause behind the sync issue and fix it. If your password isn't the problem, you might have a certificate error.

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If you haven't installed alternative security software, you should temporarily turn off Windows Defender Security Center. 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.
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