BCM SP2

[Gus]

I am experiencing a higher than normal performance degradation with
Outlook 2007 running with BCM on a dedicated server - all Outlook 2007
clients are experiencing performance issues / "freezing"/ "type-
aheads". These issues to eventually go away, but happen often enough
that it has become a business performance issue.

I have 20+ users on BCM.
All users are running Outlook 2007.
I have upgraded some of the clients with BCM SP2 - but not all of
them.
I have not yet updated the server with BCM SP2 (doing it now as we
speak).
All clients have at least BCM SP1.

Does having different versions of service packs among the 20+ users
cause a big performance hit?