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I’ve used the repair tool when this started and it did not really repair the file. I used the following combination of techniques to get the user working. In the Outlook sync help from FixTechGuide Folder Pane, you might see a folder named Recovered Personal Folders that contains your default Outlook folders or a Lost and Found folder.

Repair Outlook Data Files (.pst and .ost)

This is all most people will need, searching for older items will be slower but for daily use items it will still be quick. As you close them, lead to the folder and right-click on the OST file. Once you re-open Outlook, your OST file is automatically recreated or rebuilt. If your hard drive goes through any physical damage, it will damage the data across it too. A bad sector or corrupted hard drive can cause OST inaccessibility.

Outlook - OST file recurring corruption

The functionality is diverse, and it can be approached in multiple directions. When the case comes to rebuilding the OST file, there are several things to look out for. If modern authentication troubleshooting you can open the original Outlook Data File, you might be able to recover additional items. The Inbox Repair tool creates a backup file with the same name as the original, but with a .bak extension, and saves it in the same folder.

The Lost and Found folder contains any folders and items recovered by the repair tool that Outlook can't place in their original structure.OST file corruption is a common problem faced by Outlook users like you.Any MS techs can contact me if they need further information or analysis.You might be working on something important across it when it happens.This article will mention the process to rebuild the OST file in detail.Only way to restore Outlook 2016 (Windows) functionality was to create a new profile