You can check the location of your Outlook Data FixTechGuide support for Office 365 Files in Outlook.

Repair Outlook Data Files (.pst and .ost)

If you're using an Exchange email account, you can delete the offline Outlook Data File (.ost) and Outlook will recreate the offline Outlook Data File (.ost) the next time you open Outlook. Even with the reg hack in place, I’ve found that ost files over 50gb tend to corrupt and become unusable with regularity. OST file corruption is a common problem faced by Outlook users like you. While you seek to counter this problem, you look for effective techniques. Although there are many methods to try, a few are productive.

Outlook - OST file recurring corruption

You surely won't be disappointed with the results of rebuilding OST. As you change the extension, relaunch Outlook fix Outlook after Windows update issues 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.

• Although there are many methods to try, a few are productive.
• The Lost and Found folder contains any folders and items recovered by the repair tool that Outlook can't place in their original structure.
• To execute this, you need to have a good tool with yourselves.
• 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.
• Only way to restore Outlook 2016 (Windows) functionality was to create a new profile; this worked, and a new OST file was created.

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 offers to rebuild the OST file without putting you in any difficulty. While this is an effective model, the discussion would revolve around all possibilities. We will help our readers decide the best way to rebuild OST for functioning through Outlook. guide to Office 365 sign-in errors For the past 2 weeks, the OST of my Desktop Outlook has been corrupting continuously. I have 2 computers and both have been facing the same issue.