Great posts Jose and tamarside, Very helpful.
I will be purchasing a "clean" server sometime soon and will use this to start building the secondary domain without the rm nasties on it and will look at migrating all existing users, folder and apps over the next two years starting in the summer.
Jose: when you built your secondary domain to rid yourself of cc3 did you have MS Exchange installed on your network and if so how did you get this to function on a secondary domain?