Exchange cannot start after demote one of the GC domain controller

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?
GordonLiqAsked:
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GridLock137Connect With a Mentor Commented:
hi gordon,

as VB mentioned check the GC status, also check to make sure the authoritive servers are pointing to the new 2008 DC, also check replication configuration under Active Directory Sites and Services. make sure the exchange server's ip config has the new DC's DNS settings, meaning make sure it's pointing to the new DC and not the decommissioned server.
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VBDotNetCoderCommented:
Does the exchange server have Global Catalog Server option checked in AD-Sites And Services Snap-In ?
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VBDotNetCoderCommented:
By the way... Can you start the service manually?
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GordonLiqAuthor 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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