Trying to read your old Outlook mail archive on a computer that doesn't have Outlook installed? This write-up walks through how to open Outlook Data File using a viewer program that shows all of your mailbox contents in a clear folder list. The MSOutlookHelp PST File Viewer supports opening orphaned PST files, those not connected to any Outlook profile, so even forgotten or backed-up files can be accessed. You'll see your folders laid out just like they used to be, keeping everything familiar and easy to find. It's a handy option when you just need to read or search old messages.