The Inbox Repair Tool (scanpst.exe) is a tool designed to help repair problems associated with Personal Folder (.pst) files. In addition, the scanost.exe tool is used to repair offline folders (.ost) files. The Inbox Repair Tool automatically installs during the Outlook setup. These programs are typically located in one of the following folders depending on your Outlook version:
Outlook 2000: Program Files\Common Files\System\Mapi\1033\NT\
Outlook 2002 (Outlook XP): Program Files\Common Files\System\Mapi\1033
Outlook 2003: Program Files\Common Files\System\MSMAPI\1033
If you cannot find scanpst.exe in any of the above paths, perform a search for the file.