How to remove old Exchange 2007 server from Exchange Org?

Hi
We recently replaced our Exchange 2007 Hub / CAS (EXCHHUBCAS1) server with a new server (EXCHHUBCAS). The old server has now been re-used but unfortunately Exchange 2007 wasn't removed before the server was rebuilt and the computer account has been deleted from AD. We therefore have two HUB / CAS servers in our Exchange Org, the old and the new. Is there a way to remove the old server from the Exchange org? Out of interest when MS hopefully release a service pack for Server 2008 r2 which makes the OS compatible with Exchange 2007 we will build a new Hub / CAS server on this OS to replace the current one. This new server will have the name of the original Hub / CAS server (EXCHHUBCAS1) and the same IP address. Could I run setup on this new server with the RecoverServer switch? If so would this mean that I don't need to worry about the old server being present in the Exchange org until we do he upgrade?
Thanks

Andrew
AndrewHugesAsked:
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AkhaterCommented:
Use the following with caution, I am not to be held responsible for any mess you do with you AD domain if you do the following wrong.

open ADSIedit.msc -> connect to the configuration partition -> services -> Microsoft Exchange -> Exchange administrative group (xxx) -> servers

find the server you wanna delete right click delete
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AndrewHugesAuthor Commented:
Thanks Akhater. Just for clarification, will this remove the server from the EMC & the exchange org?
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AkhaterCommented:
yes this will remove it completely from EMC and from AD and everywhere just make sure to be careful and not delete any other object instead PLEASE :o)
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AndrewHugesAuthor Commented:
Exactly what i was after! Thanks
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AndrewHugesAuthor Commented:
that did the trick! thanks for your help Akhater.
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AkhaterCommented:
you are welcome
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