Exchange 2003 SP1 Registry Updates.

It transpires when you install E2k3 SP1 onto a server, the reg key

HKLM\SOFTWARE\Microsft\Updates\Exchange Server 2003\SP1 and subfolders is deleted to be replaced by

HKLM\SOFTWARE\Microsft\Updates\Exchange Server 2003\SP2

SP1 also removes the $ExchUnintstall directories in c:\winnt

Strange as that removes all trails of what hotfixes you did have installed Pre-SP1..

A pain for me as we have to audit old Hotfixes to ensure they were installed..