globaler katalog not found

orkinos used Ask the Experts™
I have windows 2008 servers installed.All are windows 2008 standards servers.

server2:AD2+DNS2+DHCP2(for domain controler failure)
server3:Exchange 2007
But when i try to install exchange server gives error IN LOCAL ACTIVE DIRECTORY NOT FOUND GLOBAL KATALOG SERVER.
I checed configurations on AD1 and AD2 both are Global katalog checked.

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IT Manager
Did you install Exchange prerequisites and did you update the schema?

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