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If you are talking about mailbox database make sure all the users mailbox is moved to another database, you can run powershell query from other exchange servers and find if there is still any mailbox associated with the server to be uninstalled.<br />
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Also look at this:-<br />
<a href="http://support.microsoft.com/kb/927464/da" rel="ugc nofollow">http://support.microsoft.com/kb/927464/da</a>
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If you are talking about mailbox database make sure all the users mailbox is moved to another database, you can run powershell query from other exchange servers and find if there is still any mailbox associated with the server to be uninstalled.

Also look at this:-
http://support.microsoft.com/kb/927464/da [http://support.microsoft.com/kb/927464/da]

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Nope.<br />
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All mailboxes should be moved off the database, and then the mailbox database deleted prior to removing Exchange 2007 from the server (the readiness check should alert about this). This also includes removing all public folder replicas and databases from the server you are decommissioning.<br />
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Why do you want to leave the databases in the dismounted stage anyways?
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Nope.

All mailboxes should be moved off the database, and then the mailbox database deleted prior to removing Exchange 2007 from the server (the readiness check should alert about this). This also includes removing all public folder replicas and databases from the server you are decommissioning.

Why do you want to leave the databases in the dismounted stage anyways?

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Hi Is this possible? will it uninstall cleanly or do i need to mount back the DB's?
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Hi Is this possible? will it uninstall cleanly or do i need to mount back the DB's?

uninstall exchange 2007 with datbases dismounted

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

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.