According to Microsoft Active Sync 4.5 will only work on Windows XP SP2 and lower and that Windows Mobile Device Center will only work on Windows Vista and above.
So where does that put XP SP3? I don't have an install of it hanging around to try it myself so I thought to ask, can Windows XP SP3 run Active Sync 4.5 or Windows Mobile Device Centre for the purposes of syncing to a Windows Mobile device?
ActiveSync works fine within WinXP SP3. The doc must be a typo or no one thought of getting a SP3 too.
Windows Mobile Device Center requires WinVista or higher and will also run within Windows 8 (requires to install .Net Framework 3.5 before WMDC install)..