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. Notes: The Inbox Repair tool doesn't connect or analyze any data stored in an Exchange mailbox. It has been a week since Microsoft Office 2013 preview was released to the public. And weather reports in Outlook are some of the new features. The Office team.