In Windows Vista, Windows Server 2008 and Windows 7
C:\Users\USERNAME\AppData\Roaming\Microsoft\Outlook
In Windows XP
C:\Documents and Settings\USERNAME\Application Data\Microsoft\Outlook\
Note: Change the above USERNAME to your Windows profile login name.
Default Path: In Windows XP C:\Documents and Settings\USERNAME\Local Settings\Application Data\Microsoft\Outlook\ Look for the outlook.pst file in the above folder location.
In Windows 7 C:\Users\USERNAME\AppData\Local\Microsoft\Outlook Note: Change the above USERNAME to your Windows profile login name.