[Critical] Exchange Server doesn't work after change primary domain controller

Dear, Experts

We original have 2 of Windows 2000 Server with 1 Exchange Server 2003 one of the windows 2000 is the primary domain controller.
We installed a new windows 2003 R2 server promote as our new PDC then we shut down our original PDC (win2000) now we are unable to use our email
please advice what should I do
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npanpromeAsked:
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rakeshmiglaniConnect With a Mentor Commented:
that means that there are still some roles on the old server. install and run the following MS tool.
let me know what it reports

Microsoft Exchange Best Practices Analyzer v2.7
http://www.microsoft.com/downloads/details.aspx?familyid=DBAB201F-4BEE-4943-AC22-E2DDBD258DF3&displaylang=en
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rakeshmiglaniCommented:
check the fsmo roles.
also check the GC fole.
these must be with the DC/GC that is working right now
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npanpromeAuthor Commented:
I transfer all 5 FSMO roles to the new windows server already also I setup the new PDC in the site/service as the global catalog already
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rakeshmiglaniCommented:
are all the exchange services running?
have you rebooted the exchange server after DC change?
any errors in the application log?
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npanpromeAuthor Commented:
Process MAD.EXE (PID=2184). All Global Catalog Servers in use are not responding:
domain1.abc.com
domain2.abc.com
domain3.abc.com (the new PDC)

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Process MAD.EXE (PID=2184). Topology Discovery failed, error 0x80040a02.

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rakeshmiglaniCommented:
shutdown the GC and the exchange server
after that start the GC. once it has rebooted completely, start the exchange server.
let me know the status after that.
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npanpromeAuthor Commented:
I still getting the same error, but if I turn on the original server that I shutdown (the windows2000 that's the PDC before) its working fine but if I shutdown this again it's not working at all again
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amaheshwariCommented:
Check this if it helps you:

http://support.microsoft.com/kb/896703
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