Dear All, Need your help, existing environment are Win4.0 + Exchange 5.5 with multiple DC Same OU Site#B <----->Site#A<--->Site#1<----->Site#2 I would like to upgrade Site#A & Site#1 to Exchange 2003 first. Site#A - Promo PDC to Win2K3 AD, install ADC, create two way recipient/public folder connection. - Install E2K3 join Site#A Site#1 - Promo PDC to Win2K3 AD, install ADC, create two way recipient/public folder connection. - Install E2K3 join Site#1 Then, what do I need to do for Site#B/Site#2 connect to E2K3 on Site#A & Site#1. Is it create recipient connection? One way or two way? Thanks & Regards, sammy