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There may be items in the backup file that you might be able to recover that the Inbox Repair tool couldn't. Open the OST file as per the location provided in the table. As you open it across the File Explorer, lead to the "View" menu from the top. There, turn FixTechGuide Office 365 troubleshooting on the option of "File Name Extensions" to display extensions.

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

You surely won't be disappointed with the results of rebuilding OST. As you change the extension, relaunch Outlook Outlook sync help from FixTechGuide to rebuild your OST file. The first solid question that comes to mind is whether OST files are rebuildable. We are aware that OST files are directly connected to the Outlook email.

Open the OST file as per the location provided in the table.When Outlook is running and is halted in such a way, it can damage the OST file.Convert your OST to PST for optimal results if rebuilding the OST file does not do the trick.You can try syncing outlook file 6 to 12 months or through archiving email using retention policy, could be a better way to protect the .ost size from corrupt.As you said Outlook E3 licenses should support at least 100GB of data & there’s no excuse why it can’t support OSTs above 50GB when they offer twice that space.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.You can use the Inbox Repair tool (SCANPST.EXE) to diagnose and repair errors in your Outlook data file.

What are the major Reasons of OST Corruption and how to Fix it

The question mentioned above is thus definite in such a case. It is surely possible to rebuild the OST files at any instant. Although the procedure may differ to some extent, it can be executed. This article will mention the process to rebuild the OST file in detail. Perfectly repair and recover corrupted Outlook PST & OST files.

Method 4: Use OST Repair Tool

Only way to restore Outlook 2016 (Windows) functionality was to create a new profile; this worked, and a new OST file was created. On the next screen, access the "Find File" option if you are unaware Outlook OST vs PST repair of the location. If you know the location, click on the "Add File" tab and browse it.