Thanks for all of your help. Everything in the guide is somethign that we have done. We are not having any sync problems with our exchange 07 users. Should I have both the exchange 2003 system manager and the Client and Collaboration Data Objects 1.2.1 installed on the BES server? Or is it one or the other? Rich now wwe have CCDO 1.2.1 installed on the BES and removed the exchange 2003 system manager.