We have just started to roll out the Outlook client to our users. We are using the HTTP only client and I have installed this on about 10 computers with windows xp pro, however when I attempted to install this on a computer running windows 2000 sp4 I got an error that it was not compatiable with this Opearting system. I found the Compatibility chart and I do see where it works with all other Service Packs on windows 2000 just not SP4. Does anyone know of a workaround, a hotfix or something? We do still have a lot of computers that run this OS and I don't understand why it would work with older service packs, but not the latest. PLEASE HELP!!!