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on December 30, 2025
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Once the file is selected, now click on the "Repair" and begin the repair process. If you want to stop the repair process, click on the "Stop" button. As stated in the 9646 event that is shown in the "Symptoms" section, the default limit for objtFolder objects per mailbox is 500. In Outlook 2007, this problem is more likely to occur if you also have the following registry data configured Outlook Not Sending or Receiving Email on your Outlook client. After the update, restart the system and check if the error is resolved.
Solution 8: Rebuild Outlook Data File (OST)
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. While synchronizing your Outlook with the Exchange server, sometimes you receive error messages. It leads to the occurrence of the issues of Outlook OST synchronization. In such scenarios, you need to check the proper working of the synchronization process. After rebuilding the Outlook data file (OST), you must check for any missing mailbox items.
Free Methods to Remove Duplicate Items in Outlook 2016
Each of these registered folders counts toward the objtFolder type limit on the server that's running Exchange Server. Items and logs not synced to your email by Microsoft Outlook are present in the synchronization issues folders. It is a normal Outlook function, and these messages act as error-checking mechanisms for programs that use it for syncing email services. In this article, we will discuss the synchronization issues in folders, and the method to solve it manually and automatically with the excellent Outlook Repair software. If these methods do not resolve the issue, we recommend that you rebuild the .ost file.
Part 1: What you need to know about the issues with synchronization folders in Outlook?
Users can also convert OST files into various file formats, including PST, HTML, EML, MSG, vCard, etc.As it is the replication of the existing information of Exchange Server mailbox, so the complete process does not cause any damage to the information.Now, we will verify the server settings to fix the Outlook synchronization error.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.After the update, restart the system and check if the error is resolved.Sometimes because of a corrupted OST file synchronization process stops functioning properly and thus leads to error.If restarting Outlook or fixing the profile doesn’t work, converting the OST file is often the next step.
Therefore, now we will know the steps to repair the Outlook data file. Sometimes because of a corrupted OST file synchronization process stops functioning properly and thus leads to error. If you see any mismatch in the data, then the methods discussed in this guide will surely help you resolve the issue. When you add other mailboxes to your Outlook profile and enable caching of the shared mailbox folders, Outlook individually registers every folder in each cached mailbox.
For Outlook 2019, Outlook 2016, Outlook 2013, Outlook 2010, and Outlook 2007
It scans your local copy of the .ost file and your mailbox on an Exchange Server. The tool compares items and folders in the file and in your mailbox and tries to reconcile synchronization differences between the files and the mailbox. The OST Integrity Check Tool does not change your mailbox on the Exchange Server.
Symptoms
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 Outlook Login Issues Troubleshooting updated. Sometimes this process gets corrupted, and this leads to sync errors. We recommend using the automatic process and fix the issue with Wondershare Repairit for Email.
So, follow the below steps to reset Microsoft Outlook settings. After the files get repaired, restart the Outlook program to ensure that the Outlook syncing issues are resolved or not. You can see the synchronization status here and your new .ost file now. As it is the replication of the existing information of Exchange Server mailbox, so the complete process does not cause any damage to the information. See your Exchange Server administrator for this information or permissions.
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 Stuck on Synchronizing Folders Outlook sync errors, kindly check if the error has been fixed or not.