Fix for Corrupted Exchange OST file
Email messages, calendar, tasks and other items are saved on a server and your computer, on your computer, they're saved as Outlook Data Files (.pst or .ost). Just like any file, there is a possibility that the Outlook Data Files can become corrupted. This can be seen as missing emails, emails displayed with the wrong info in them or Outlook not being able to run at all.
This fix is for Microsoft Exchange Email accounts only, which means a .ost file.
This fix assumes that you have access to Outlook but could just as easily be performed by going directly to the folder where your .ost is stored.
Rename and recreate a corrupted .OST file
Locate the .ost file.
1. In Outlook click the File menu, then click Info
Rename the .ost file by right clicking on the file and selecting Rename.
- We suggest rename the file to ost.old
Re-open Outlook. Outlook should start to configure a new data file, but will retain all previous settings, including signatures and autocomplete email addresses.
- This process can take awhile depending on your mailbox size and network speed.
When your mailbox has been rebuilt you'll see the message, "All folders are up to date" in the lower right hand corner.