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Opened Nov 30, 2025 by Silas Oneal@silas19x70099
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Performance and Synchronization Problems When You Work With Folders in a Secondary Mailbox Outlook Microsoft Learn

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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.

However, the level of corruption is not a matter of concern with this excellent tool. Moreover, its user-friendly GUI interface is very easy to use. By default, Outlook 2007 caches only those shared folders that don't contain email (such as Calendar, Contacts, and Tasks). Here, we will discuss the five manual methods to fix sync issues in Outlook or OWA. Before finding solutions, we suggest that users check their internet connection. Sometimes, Outlook sync issues can arise because of poor internet connection.

Free Methods to Remove Duplicate Items in Outlook 2016

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. After the conversion, you can import the PST into your newly created Outlook account via the Import Export wizard. The software can also directly export the OST file data to an existing Outlook profile, live Exchange Server, or Microsoft 365. The other solution to fix Outlook sync issues is recreating Microsoft Outlook profile.

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 Exchange connectivity diagnostic 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 fix MFA prompts not working of folders and subfolders that are in a mailbox or folder, run the Get-MailboxFolderStatistics cmdlet.

synchronizing subscribed folders = error message

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 automatic process and fix the issue with Wondershare Repairit for Email. 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.

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. Outlook sync issues can be because of corrupted Outlook OST or PST files. Therefore, now we will know the steps to repair the Outlook data file.

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.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.Before we know the solutions, we will understand a few common causes of the Outlook sync problem.

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 Outlook data file cannot be accessed 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

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: silas19x70099/2990608#3