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Opened Dec 01, 2025 by Janine Winkel@janinewinkel44
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How to Fix Outlook Syncing issues?

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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.

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 on your Outlook client. After the update, restart the system and check if the error is resolved. After these instructions, ensure the sync settings are correct and check everything is working well. 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. To view the scan log, start Outlook, and then open the Deleted Items folder.

Free Methods to Remove Duplicate Items in Outlook 2016

You must select the Folder List module on the Navigation pane to see the Sync Issues folder in your mailbox. Please whitelist stellarinfo.com and request to send the link again. The software allows you to view your repaired files and confirm before saving them.

Ways to Fix Outlook Error Synchronizing Folder

Any problems are noted in a message that has "OST Integrity Check" as its Subject. The OST Integrity Check Tool (Scanost.exe) is installed when you install Outlook in the following locations, as appropriate for the Outlook version that you are running. For more information about the maximum allowed share of server resources on Microsoft Exchange Server 2007, see A user is fix Outlook after Windows update issues consuming their maximum allowed share of server. In the main interface, you need to click on "Select PSF/OST file to repair" to upload the required file.

Symptoms

Before we know the solutions, we will understand a few common causes of the Outlook sync problem. If disabling the software resolves the issue, then change your antivirus and firewall settings and add Outlook as an exception. Use the OST Integrity Check Tool (Scanost.exe) to check your .ost file for inconsistencies. In order to determine the number Outlook Stuck on Synchronizing Folders of folders and subfolders that are in a mailbox or folder, run the Get-MailboxFolderStatistics cmdlet.

synchronizing subscribed folders = error message

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. 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. There are various methods to resolve the Outlook sync issues, including manual and third-party solutions.

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.

The in-built Synchronization process happens when your OST or PST files get updated.You can see the synchronization status here and your new .ost file now.Follow each step carefully to resolve synchronization errors.The other solution to fix Outlook sync issues is recreating Microsoft Outlook profile.For more information about the maximum allowed share of server resources on Microsoft Exchange Server 2007, see A user is consuming their maximum allowed share of server.We recommend using the automatic process and fix the issue with Wondershare Repairit for Email.After rebuilding the Outlook data file (OST), you must check for any missing mailbox items.Before we know the solutions, we will understand a few common causes of the Outlook sync problem.Sometimes this process gets corrupted, and this leads to sync errors.

When these symptoms occur, or you have other problems synchronizing, the problem might be a corrupted .ost file. When synchronization issues occur in Microsoft Outlook or in Microsoft Outlook Web App (formerly Outlook Web Access), you may experience the following symptoms. If your account doesn't have full mailbox permissions to the secondary mailbox, you're prompted FixTechGuide fix for stuck folders for the account credentials to the secondary mailbox.

For Outlook for Office 365

If this method doesn’t work for you, navigate to other solutions. We have given you complete information about the synchronization issues folders in Outlook, and the ways to solve it manually and automatically. Check whether the numbers of items in the Offline and Server folders are the same. If it's the same, then synchronization is proper, but in case of variation, check profile settings.

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.

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Reference: janinewinkel44/rosetta2000#1