Moving to new 2003 exchange server and cannot bring down old 2000 exchange

I have gone through all the procedures of removing the first exchange server from our organization using article ().  When we bring down the old server none of our users can access email.  Outlook error says cannot contact exchange server or exchange server is unavailable.  Also we get an error in ESM on the 2003 server that reads:
The RPC server is unavailable
Facility: Win32
ID no: C00706ba
Exchange system Manager

I have change the Recipient Update service to reflect the new server and have check all dns settings.
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RussianblueAsked:
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kristinawCommented:
http://support.microsoft.com/kb/822931/
http://support.microsoft.com/default.aspx?scid=kb;en-us;307917

you should be following one of the above articles depending on what version of exchange the old server was.

do you have another domain controller/gc in this site? your new exchange server is probably picking up on the old dc as it's dsaccess server. check the dsaccess tab in the 2003 esm and see what server it lists in there.

kris.
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kristinawCommented:
is the old 2000 server also a domain controller?
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RussianblueAuthor Commented:
yes it is
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RussianblueAuthor Commented:
The old server is Exchange 2000.  the new computer is a 2003 R2 Domain Controller.  The new DC/Exchange2003 server is set as a Global Catalog.  The 2000 server is also a GC.  I used the second article to remove the 2000 Exchange server from the org.  The only problem is that if I take the 2000 server down the mail is not accessible.  So I can not uninstall until this problem is resolved.  I will post something on the dsaccess as soon as I check on it.
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kristinawCommented:
russian,

did you get the results of the dsaccess tab yet?

kris.
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