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Exchange cannot start after demote one of the GC domain controller

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Last Modified: 2012-05-10
Hi ,
I have 2 server both 2003 R2, one is main domain controller with FSMO roles
one is exchange 2007 server with domain controller installed as well.

yesterday , I have install a new 2008 R2 installed , and move the FSMO to this domain contorller and demote the 2003R2 to member server.

after done this , users can still login to all desktops.
but the exchange information store service cannot not be started,
it show the error
Error 0x96e connecting to the Microsoft Active Directory.

Event 1121 and 5000.

how can I fix it?

is there anywhere to remember the DC that will access to in exchange , do I have to keep the 2003 R2 box as Domain controller?
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Does the exchange server have Global Catalog Server option checked in AD-Sites And Services Snap-In ?
By the way... Can you start the service manually?
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Commented:
change the DNS setting of Exchagne server to new DC, and do a clean reboot fix the problem

exchange server is a DC but the GC is not checked.
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