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You should be able to use the exchange system manager to disconnect the mailbox, without it affecting AD.
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Whoopee. Obvious when you tell me. I was focuing on the exchange GUI and it wasn't obvious how that worked. Many thanks Brian.
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I'm migrating services. Currently I have just one user using Exchange 2003. I want to remove Exchange 2003 from the domain, ending the user's mail faciilty but keeping their profile in the 2003 AD. The user is not being migrated to any other exchange service. How do I do this?
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I'm migrating services. Currently I have just one user using Exchange 2003. I want to remove Exchange 2003 from the domain, ending the user's mail faciilty but keeping their profile in the 2003 AD. The user is not being migrated to any other exchange service. How do I do this?

Removing Exchange 2003

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.