Outlook All Versions
From Free Knowledge Base- The DUCK Project: information for everyone
By default, Outlook places each Offline Folders (.ost) file and Personal Folders (.pst) file that it creates in the %userprofile%\Local Settings\Application Data\Microsoft\Outlook folder. You can either use a registry value to change that default location, or you can manually create a new profile and specify the .ost filename and folder.
