Or do you receive an error message while synchronizing your offline folder? All these scenarios indicate problems with the synchronization folder or corrupted .ost file. These syncing problems usually how to Fix Outlook not opening today happen because of issues like a damaged Outlook profile, poor internet connection, or a corrupted OST file.

Solution 4: Disable Antivirus and Firewall Temporarily

However, serious problems might occur if you modify the registry incorrectly. 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 connection status shows disconnected 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.

Solution 7: Create a New Profile

After trying all the methods, is the outlook error synchronizing folder not resolved? You can try fixing it automatically with the Wondershare Repairit for Email. As PST files are bigger and so chances of the getting corrupted are high.

Solution 8: Rebuild Outlook Data File (OST)

In order to determine the number of folders and subfolders that are in a mailbox or folder, run Office 365 sync problems and login fixes the Get-MailboxFolderStatistics cmdlet. 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.

Solution 1: Update the Outlook Application

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. 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.

• It leads to the occurrence of the issues of Outlook OST synchronization.
• We have given you complete information about the synchronization issues folders in Outlook, and the ways to solve it manually and automatically.
• You can see the synchronization status here and your new .ost file now.
• In the main interface, you need to click on "Select PSF/OST file to repair" to upload the required file.
• The Inbox Repair tool can be used on both .ost files and on Personal Folders (.pst) files.
• This tool also helps users fix Outlook syncing issues by repairing OST or PST files and syncing the data smoothly.
• You can try fixing it automatically with the Wondershare Repairit for Email.
• 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.

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. Items and logs not synced to your email by Microsoft Outlook are present in the synchronization issues folders.



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. 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.