The Inbox Repair tool is automatically installed with all English-language Microsoft Outlook installation options depending on your operating system.

For Microsoft Windows NT and Microsoft Windows 2000:
C:\Program Files\Common Files\System\Mapi\1033\NT
For Microsoft Windows 95 and Microsoft Windows 98:
C:\Program Files\Common Files\System\Mapi\1033\95
The Inbox Repair Tool installs automatically during Microsoft Outlook 2002 and Microsoft Office Outlook 2003 setup. Unlike the Microsoft Office 97 version of the tool, Microsoft Office 2000 does not place the Inbox Repair tool on a menu. To use the Inbox Repair tool, locate one of the folders by using Microsoft Windows Explorer, and then double-click the Scanpst.exe file.

The Scanpst.exe file is typically located in one of the following folders:
<disk drive>:\Program Files\Common Files\System\Mapi\1033\
<disk drive>:\Program Files\Common Files\System\MSMAPI\1033
The Scanpst.exe file for Outlook 2007 is is typically located in the following folder:
<disk drive>:\Program Files\Microsoft Office\Office12
<disk drive>:\Program Files(x86)\Microsoft Office\Office12
The Scanpst.exe file for Outlook 2010 is typically located in the following folder: 
<disk drive>\Program Files\Microsoft Office\Office14
<disk drive>\Program Files\Microsoft Office(x86)\Office14

To run the Inbox Repair Tool, follow these steps:

    Click Start, and then point to Find or to Search, depending upon your operating system.
    In the Search for files or folders named box, type scanpst.exe
    Note If you cannot find the Scanpst.exe file in the Search box, try to locate the file manually.
    Double click the Scanpst.exe file to open the Inbox Repair Tool.
    Type the path and the file name of the personal folders (.pst) file or click Browse to locate the file by using the Windows file system.
    Click Start.