.ost is the Offline Folder File used by Exchange.
How to determine if a profile is corrupt:
This is the type of error that you might get - if for instance your outlook refuses to open one folder with this error.
To make sure it is a corrupt Profile - Add the mailbox to your mailbox - open the folder - or ask the User to try and open this folder using Outlook Web Access.
If the user can access their folder on OWA - please open Outlook - Tools - Accounts - remove the account & recreate via control panel - mail.
For convert ost to pst files you may use ost 2 pst. It allows to opening corrupted mailboxes from any types of HDD, uses modern methods of repairing damaged or lost data. Software doesn't modify data after working, because it uses copies of data.
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