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Opened Nov 30, 2025 by Marcelino Osullivan@marcelinoosull
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How to Fix Sync Issues in Outlook or OWA? A Complete Guide

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Firstly, we will discuss a few manual methods to resolve this Outlook error and share the stepwise procedure of each method to successfully fix synchronization issues. Now, let us start with the manual processes to fix Outlook syncing errors. If users are facing syncing issues in Outlook due to corrupt Outlook data files, they must choose a professional tool, like Shoviv OST to PST Converter Tool. This software allows users to process numerous OST files at once without any size limitations.

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 clear Outlook credentials manager 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

Confirm and click on "OK." Select the location where you want to save the file. 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 troubleshoot Outlook synchronizing folders Error the "Stop" button.

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.

How to Fix Sync Issues in Outlook or OWA? – A Complete Guide

The in-built Synchronization process happens when your OST or PST files get updated.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.There are various methods to resolve the Outlook sync issues, including manual and third-party solutions.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 fix MFA prompts not working 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.

Method 1: Reduce the number of folders in the Shared mailbox

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. Each of these registered folders counts toward the objtFolder type limit on the server that's running Exchange Server.

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Reference: marcelinoosull/8221316#1