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on January 15, 2026
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After you make this change, none of the shared folders in the secondary mailbox will be available to you in Outlook when you're working offline. However, all folders in the primary mailbox will still be available to you when you're working offline. Conflicts with antivirus software or firewall can impact Outlook's synchronization process. You can temporarily turn off your antivirus software webpage and firewall. After performing these steps, Outlook’s all folders will be synced to the server.
How to rebuild the .ost file
Sometimes, Outlook sync issues can arise because of poor internet connection. If you are still facing this issue, kindly follow the solutions below to fix the sync issues in Outlook. If you have problems when you try to open your .ost file, you can use the Inbox Repair tool (Scanpst.exe) to diagnose and repair errors in your .ost file.
Method 4: Recreating the Outlook Profile
For protection, back up the registry before you modify it so that you can restore it if a problem occurs. For more information about how to back up and restore the registry, see How to back up and restore the registry in Windows. Now, we will verify the server settings to fix the Outlook synchronization error. The in-built Synchronization process happens when your OST or PST files get updated. Sometimes this process gets corrupted, and this leads to sync errors. We recommend using the Office 365 Sync Errors Fix automatic process and fix the issue with Wondershare Repairit for Email.
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Are you finding mismatches in the messages received in Microsoft Outlook in comparison to its web app? Or do you receive an error send/receive error 0x800CCC0E fix message while synchronizing your offline folder? All these scenarios indicate problems with the synchronization folder or corrupted .ost file. 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.
Symptoms
This excellent software is easy to use and fixes the issue quickly.This section, method, or task contains steps that tell you how to modify the registry.It also provides the option to export the Outlook OST file into Office 365 and Live Exchange mailboxes.The OST Integrity Check Tool does not change your mailbox on the Exchange Server.After the conversion, you can import the PST into your newly created Outlook account via the Import Export wizard.The Inbox Repair tool scans the .ost or .pst file and makes sure that the file structure is intact.It scans your local copy of the .ost file and your mailbox on an Exchange Server.
This excellent software is easy to use and fixes the issue quickly. Whether it's a bigger file size or smaller, the software can repair all file types with any level of corruption. Once you have completed the steps to fix Outlook sync errors, kindly check if the error has been fixed or not. Knowing the reasons behind the Outlook sync issues will help us to fix this problem and prevent issues in communication and workflow. There can be several reasons for the Outlook synchronization error.
For Outlook 2019, Outlook 2016, Outlook 2013, Outlook 2010, and Outlook 2007
The Inbox Repair tool can be used on both .ost files and on Personal Folders (.pst) files. 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. The tool does not interact with your mailbox on the Exchange Server.