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. I don’t have an answer to this other than to voice my suspicion that it is likely due to new Microsoft updates (windows and office). guide to Office 365 sign-in errors Find the .ost file that the error message reported to have errors, and then delete it and open outlook, it will recreate a new .ost file. 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.

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

Although the repair process might recreate some of the folders, they may be empty. The connection status shows disconnected Lost and Found folder contains any folders and items recovered by 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.

• The Lost and Found folder contains any folders and items recovered by the repair tool that Outlook can't place in their original structure.
• 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.

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

Confirmed user 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.

Method 4: Use OST Repair Tool

This article has provided an overview of how you can quickly rebuild an OST file. With the methods and Wondershare Repairit for Email, you can make cohesive use of the available resources. Get your OST rebuilt properly with Outlook Login Issues Troubleshooting the help of the available techniques.