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Exchagne 2010 Install

Trying to install Exchange 2010. Everything is working okay, but when running Organization Prerequisites It tells me that there is one or more server in the existing organization running Exchange Server 2003 without service pack 2....

Problem is there is not an Exchange server 2003 in AD...but I do remember installing Exchange 2003 on a server, but it no longer exists. It seems that "pieces" of that 2003 install is hanging out in AD making 2010 think one still exists.

Anyone know how to remove the 2003 "pieces" to make  this install proceed? or will I have to start over with AD :-(  

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2 Solutions
Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
Run ADSIEdit and delete the "old" server entry.
Bit more detail on ADSIEdit solution:
Open ADSIEdit and drill down to
Configuration\services\Microsoft exchange\<org>\administrative groups\ and then look for your old E2k3 server then delete it
 You can do the BIG cleanup in AD (make backup of your AD (system state) before) :  Remove the "Exchange Organization" which store all exchange servers' configurations

-- warning you can break your AD if you don't do things carefully ---

run ADSIEDIT.MSC , go to Configuration partition (Cn=Configuration,DC=yourdomaine,DC=yoursuffixTLD).

Go to Cn=Configuration,DC=yourdomaine,DC=yoursuffixTLD
then down to "CN=Services"
the down to "CN=Microsoft Exchange"
It should contain 2 child items: CN='Active Directory Connections' and one another (CN=<your old exchange organization name>

DELETE this last  CN=<your old exchange organization name> (and all the subtree beneath)
DO NOT DELETE the 1rst  CN='Active Directory Connections'

And Voila, you have  cleaned your AD from any old exchange installation. You can install a fresh Exchange server

What mail system are you currently on while you wait to go to exchange 2010? Hopefully not exchange as jbvernej just wiped your whole Exchange org...

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