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October 31, 2025 at 1:30 pm #16187
The OST Integrity Check Tool does not change your mailbox on the Exchange Server. The tool records any differences in a scan log so that you can see what differences the tool found and resolved. The scan log also identifies any situations that the tool could not resolve and that you must fix manually. During the scanning process, security applications, like antivirus software or Windows Firewall might lock the Outlook data file, leading to the sync issues. To check if the security application is causing the issue, you can temporarily disable the antivirus program or Firewall and then update the folders. If the issue is resolved, it indicates that your antivirus software or Firewall is interfering with Outlook.
My inbox is not syncing…HELP please
It verifies your identity using your password and a contact method (also known as security info).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account using advanced setup.These sync hiccups can stem from various sources, including network connectivity problems, outdated software, or conflicts between different calendar services.For a similar error caused by a different issue, refer to Outlook shows Disconnected in status bar if the last character in legacyExchangeDN is a space.If you haven’t installed alternative security software, you should temporarily turn off Windows Defender Security Center.It’s worth noting that sometimes, what appears to be a sync issue might actually be a delay.
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.” 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.
Method 13: Create a New Outlook Profile
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.
Troubleshooting sync issues on mobile devices
How do I reset Outlook sync? <br><br>
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.
How to resolve the issue of Outlook not syncing in Windows?
An app password is used instead of your normal account password for apps that Solutions for Office 365 problems don’t support two-factor authentication. Before you begin, make sure that your device has the latest operating system and app updates. Try the general troubleshooting solutions in Troubleshooting Mail and Calendar apps for Windows 10.
These syncing problems usually happen because of issues like a damaged Outlook profile, poor internet connection, or a corrupted OST file. If restarting Outlook or fixing the profile doesn’t work, converting the OST file is often the next step. EdbMails OST to PST Converter can help in these cases by recovering data from the inaccessible OST files and restoring them without data loss. 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. While Outlook provides robust calendar features, integrating additional tools can significantly enhance your scheduling experience.
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Remember, creating a service ticket usually requires admin privileges. If you’re not an admin, you’ll need to contact your IT department to create a ticket on your behalf. Remember to restart your device after installing updates to ensure all changes take effect. In essence, a well-synced calendar is not just a convenience—it’s a crucial tool for personal and professional success in our fast-paced, digital-first world.
When synchronization issues occur in Microsoft Outlook or in Microsoft Outlook Web App (formerly Outlook Web Access), you may experience the following symptoms. Now, manually sync your mailbox using the Update Folder button under the Send/Receive tab. Check with your email provider for instructions about how to create an app password for your email account. 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.
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