Exchange 2003 SP2 offers the ability to receive IMF updates bi-monthly via the Microsoft Update website. For the IMF updates to show up on Microsoft Update, a registry key must first be added.
Key Location: HKLM\SOFTWARE\MICROSOFT\EXCHANGE\
Key to create: ‘ContentFilterState’
Key Type: DWORD
Key Value: 1
To check the status of IMF updates, browse to the Program Files\Exchsrvr\Bin\MSCFV2\ directory. You should see a series of sub directories named for the IMF update versions contained within.
Reference the following URL: