I have been thinking about it for a while now... I have Exchange 2000 sp3 running on 2K server which is also DC2 in the domain. It is not a GC or anything, just a secondary DC in the domain. I installed DC on the server first and then Exchange software. Everything seems to running good, except i have some replication issues with GC DC. Someone previously made both of the DC's GC and AD was getting confused, but i made the chages back as you can have only one GC server per domain. Now i am having all kinds of "strange" issues with replication and i was wondering if i can demote this server to memeber server, remove AD from it and later on proote it back to DC. This should cleanup my connections and regenerate them again. If i do demote this server which has Exch2000 on it, will the mail server sill work without DC on it??? Have anyone done this before??? Vadim.