how to remove/demote win NT PDC BDC off 2003 AD

Hi here is a quick question:

current we are using AD 2003. I found two PDC and BDC from our old NT 4.0 still list in the 'domain controllers' under 'active directory users and computers'. even tough they are all physically shutdown for quite a while. one of them even can not boot up.
how could I gracefully remove them off the list or just right click and 'delete'?

thanks so much!!!
robinyanwangAsked:
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craigothyConnect With a Mentor Commented:
Raising the domain functional level happens fairly quickly.  You will get a confirmation that it was successful and that it will replicate with the other domain controllers in the domain.  It does not cause any downtime.
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craigothyCommented:
Refer to the following article from Microsoft:
http://support.microsoft.com/kb/555521
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geedoubleuCommented:
Its quite a long winded process.

You need to follow this kb to the letter.

http://support.microsoft.com/default.aspx/kb/555846

Once complete the domain controller will be succesfully removed.

Don't forget to have backups in place to do a forest recovery in just in case it goes horribly wrong.
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robinyanwangAuthor Commented:
it is only about BDC... for the PDC, the same thing?
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craigothyCommented:
In order to have performed a successful migration, the NT4 PDC is the first Domain Controller to be upgraded.  Therefore, you should not have a NT4 PDC any longer.  Where are you seeing this server listed as a PDC?
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robinyanwangAuthor Commented:
good, thanks. I removed old NT domain controller off via adsiedit.

another question:

we have two DC (2k3 server) left and still running in 'windows 2000 native' domain functional level.

I would like to raise it to 'windows server 2003', would it have any issue with my currnet exchange server 5.5?

thanks again!
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craigothyCommented:
Domain Functional Level is related to your Domain Controllers (not your exchange environment).  Therefore, if you only have 2003 domain controllers in your domain, then you can raise the domain functional level to 2003 native.  Hope that helps.
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robinyanwangAuthor Commented:
how long does this process gonna take? can i do it now during office hours or have to do it at night or weekend...
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robinyanwangAuthor Commented:
all done!
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