Active Directory/Exchange Problem

[twinkles]

All,

Before I joined my current employer the admin here upgraded from Exchange 5.5 to Exchange 2000(Box A) and then added another Exchange 2000 box to the organisation(Box B)and migrated the data in Box A to Box B. Box B is now the working exchange server and Box A is no longer used.

The problem is that if I actually shut down Box A I can add a new user to Active Directory but I am unable to modify a users details. All mail can still be transferred with no problems which would lead me to believe that Exchange is Ok but there is some sort of Active Directory link between the two boxes that need both powered on.

I know the place to look is at the schema level but that a dangerous place and I don't want to mess everything up.
Can anyone please help me on this because I need to get this sorted or I will be in trouble. If more details are needed I will be more than happy to give them

Twinkles

 

[Airshot]

Check which FSMO roles are performed by box A, and transfer them to box B before shutting down box A.
See

http://support.microsoft.com/default.aspx?scid=kb;en-us;255690

for further information.