Your Outlook Data File is composed of a file header, located at the beginning of the document, and the actual data that makes up your personal folders. Contained in the header is information about the ...

Offline storage table (OST) and personal storage table (PST) are two different Outlook data files used to store a copy of mailbox items on local storage. Outlook creates a PST file when you add a POP3 ...

Some users have reported that when they open MS Outlook, they receive an error message that Outlook is using an old copy of your Outlook data file (.ost). For some ...

One of my colleagues called me recently when he was having trouble receiving e-mail. He uses Microsoft Outlook 2007, as I do. I asked whether he had checked the file integrity of his e-mail ...

If you cannot open Microsoft Outlook for some reason, it can make communicating with employees, clients or suppliers rather difficult in some cases. There are several reasons you may not be able to ...

Editor’s note on March 18, 2019: This Outlook article was first published in September 2013. Since then, we have added a video tutorial, updated steps in the Rebuild section, and updated the related ...