The WebbyAcad OST Recovery Tool offers advanced features to fix damaged OST files and convert them to PST, EML, MSG and other formats while preserving folder hierarchy and metadata. It supports all Outlook versions and has no file size limitations, making it a comprehensive solution for recovering inaccessible OST data. Change the Outlook sync settings to only keep a limited amount of mail off-line. If you only keep 6 or 12 months offline that will reduce the OST size significantly. 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.

I can't repair corrupted Outlook .ost file

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.

Part 1: Can OST Files Be Rebuild?

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. If you can open the original Outlook Data File, you might be able to recover additional items. The solve Office 365 mailbox sync delays 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.

Method 3: Convert OST to PST

Although the repair process might recreate some of the folders, they may be empty. The Lost and Found folder contains any folders and items recovered by repair PST file without data loss the repair tool that Outlook can't place in their original structure. 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

Confirmed user Fix Outlook Not Opening After Windows Update can log on to OWA (Office 365 webmail) without issue. Upon starting Outlook, error message displayed is "Errors have been detected in the file ," then prompt appears to locate (not fix) the OST file. Outlook 2016 connecting to Office 365 E3, mailbox size ~55GB and Outlook reghack effected to allow for ~80GB OST. If your computer faces unnecessary power outages during a process, it can be damaging. When Outlook is running and is halted in such a way, it can damage the OST file.

• We are aware that OST files are directly connected to the Outlook email.
• Virus attacks can directly attack the OST file, which would disrupt its data.
• Wondershare Repairit for Email fixes all OST file issues with ease.
• The Inbox Repair tool checks the Outlook data files on your computer to see if they're in good shape.
• With an OST file in your hand, you can even retrieve it if it gets corrupted.
• Confirmed user can log on to OWA (Office 365 webmail) without issue.
• While this is an effective model, the discussion would revolve around all possibilities.
• If the problems occur across the synchronization of the OST file, it would be damaging.

As you change the extension, relaunch Outlook 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. The question mentioned above is thus definite in such a case.

Additional resources

The file would get inaccessible and won't update in any case. To the ones that said 50Gb are more than enough for most people,… well we are in 2020 & I can assure you that more than half of the accounts we manage are way above 50Gb, close to 100Gb actually. 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 of the location. If you know the location, click on the "Add File" tab and browse it.