Removing orphaned Exchange servers (2003) from AD 2008 to install fresh EX 2010

All 2003 AD and Exchange 2003 servers no longer exist in domain. Did not run forestprep before adding 2008 AD. Trying to install fresh EX 2010. We have tried "setup /removeorg" from Ex 2003 cd but had compatability problems. Would like to remove all old Exchange 2003 from new AD. Problems first occoured when trying to install EX 2010, saying "the exchange organization is not in native mode", and "the forest  functional level must be at least windows 2003 native"

Thanks
Matt KolkkaAsked:
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Shivkumar SharmaOperations Delivery ManagerCommented:
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Matt KolkkaAuthor Commented:
Have tried "/removeorg", but it comes up with "This program is blocked due to compatibillity issues". Same thing when trying to install Exchange 2003 on server 2008... is there something different I have to do in Server 2008 to be able to run /removeorg?

Thanks
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Shivkumar SharmaOperations Delivery ManagerCommented:
Simply go ahead and delete the Exchange server entries through registry and Active directory (through Adsiedit.msc) manually and then replicate and then try a fresh installation of exchange but before that take a system state backup and Registry backup.
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Matt KolkkaAuthor Commented:
We have cleaned the registry and used adsiedit.msc previously with no luck. When installing exchange 2010 we still get the "the exchange organization is not in native mode" error and it wont let us past this point in the installation. If we can either get it into native mode or delete all old exchange instances, we can then proceed

Thanks
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Shivkumar SharmaOperations Delivery ManagerCommented:
Hope you have already tried all the steps and nort missed any step from the below link

http://www.msexchange.org/tutorials/Remove-Exchange-server-entire-Exchange-organization.html
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Matt KolkkaAuthor Commented:
have been through this link..no good
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Shivkumar SharmaOperations Delivery ManagerCommented:
This article has detailed instructions on how to manually remove a single Exchange server from AD:

http://support.microsoft.com/kb/833396/
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Matt KolkkaAuthor Commented:
have done that as well no good..did have sugestion to run Ex 2003 setup /removeorg from a seperate PC. running this brigs up "The organization "xxxx"will be removed from the Active directory.
Only problem is "xxxx" is my domain name. I don't want to remove my domain only old exchange servers. Will this drill down so I can choose what to delete, I need an answer from someone who has done this please, you can see my hesitation at this point.
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Shivkumar SharmaOperations Delivery ManagerCommented:
My aplogies for replyinglate as I was on vacation, When is says "The organization "xxxx"will be removed from the Active directory." it will only remove the exchange org and not the domain from the active directory.
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