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on December 26, 2025
ScanOST.exe was a fantastic program that was available until Outlook 2007 and now find the Alternative of ScanOST.exe Utility. It was used to fix a corrupted, inaccessible, or damaged Offline Storage Table (OST) file. The software will create a new healthy PST file without any error. ScanPST.exe works just fine enough if only a minor PST file corruption exists. However, it makes limited intervention with anything more complex in natur
Before we know the solutions, we will understand a few common causes of the Outlook sync problem. Re-adding the account forces Outlook to rebuild all folders and clear old stuck subscriptions. To view the scan log, start Outlook, and then open the Deleted Items Outlook OST vs PST repair folder. Any problems are noted in a message that has "OST Integrity Check" as its Subject. After these instructions, ensure the sync settings are correct and check everything is working wel
Outlook and Office 365 sync issues can be frustrating but are almost always fixable. Start with basic network checks, enable Cached Exchange Mode, and repair your data files Outlook OST vs PST repair if needed. For persistent problems, rebuild your Outlook profile or use FixTechGuide’s free diagnostic tools to automate detection of authentication and IMAP errors in seconds. The OST Integrity Check Tool runs only on .ost files and can be used to diagnose and repair synchronization issue
The error message in the Summary sheet of the Sync Summary spreadsheet attachment can also highlight the reason for this. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. However, his OST file is not anywhere near that size it’s about 5GB. Here is the strange part I tried to remove the computer from the domain and have Outlook run from a local account for a few day
Find out what to do if you are having issues with syncing users or groups from Microsoft 365. Are you facing Microsoft Office 365 not opening or continuing to Outlook OST vs PST repair crash? This is one of the most frustrating issues with Microsoft Office, often caused by update failures, corrupted files, or compatibility problem
The sync will fail if the groups you selected to load users from no longer exist in Azure AD. Typically this is because the selected groups have been deleted from Azure AD since the M365 sync was configured on your account. To get the sync working you will either need to delete users or have the user limit on your account increased. The most common reason for missing users is that you've run a Test Sync, instead of a Manual Sync. If that doesn't resolve your missing users issue, please follow our guide to troubleshooting missing users belo
But it allows provisioning of new objects that are otherwise blocked from being provisioned because of duplicated values in Microsoft Entra ID. This capability also reduces the number of synchronization errors returned to the synchronization client. Microsoft Entra attribute duplicate attribute resiliency is also being rolled out as the default behavior of Microsoft Entra ID. This feature reduces the number of synchronization errors seen by Microsoft Entra Connect and other sync clients. It makes Microsoft Entra more resilient in the way it handles duplicated proxyAddresses and userPrincipalName attributes present in on-premises Active Directory environments. For the soft match to work, the object to be soft-matched with shouldn't have any value for the immutableId attribut
21Vianet understands that receiving timely technical support from qualified professionals is a key aspect of cloud services. Equally important is the critical role that the customer's IT department plays in the support of its users. The Microsoft 365 operated by 21Vianet technical support team troubleshoots only those issues that are related to Microsoft 365 operated by 21Vianet.
Moreover, it maintains the folder hierarchy and metaproperties of the data when processing Outlook data files. This tool also helps users fix Outlook syncing issues by repairing OST or PST files and syncing the data smoothly. When Outlook gets stuck on "Synchronizing Folders", it’s usually a sync or file corruption issue — not a permanent failure. By following these methods step-by-step, you can restore full email synchronization without reinstalling Outlook. FixTechGuide continues to help users resolve Outlook and Office 365 errors Outlook OST vs PST repair quickly and safely. There are various methods to resolve the Outlook sync issues, including manual and third-party solution
Now, let us start with the manual processes to fix Outlook syncing errors. The other solution to fix Outlook sync issues is recreating Microsoft Outlook profile. After the files get repaired, restart the Outlook program to ensure that the Outlook syncing issues are resolved or not. 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. Here, we will discuss the five manual methods to fix sync issues in Outlook or OW