Down grade Schema to use Exchange 2003

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    On a 2003 domain that did not have Exchange installed previously – no forest prep or domain prep for exchange 2000 or 2003, I installed Exchange 2007 which performed forest and domain prep. Their anti-spam software doesn’t support 2007 yet and I would like to go back to Exchange 2003. It will not let me install Exchange 2003 as it says the forest prep has not been completed and it won’t let me apply Exch 2003 forest prep. Is there a way to downgrade the schema or rollback the schema or force an Exchange 2003 install after Exchange 2007 schema update?


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