Can't uninstall Exchange 2003 front-end server in DMZ

Have a client with Exchange 2003 and I upgraded them to 2007.  They have a 2003 exchange server in DMZ that I am having trouble uninstalling.  See error below.

"The component 'Microsoft Exchange Messaging and Collaboration Services' cannot be assigned the action 'Remove' because:
- Setup encountered an error while trying to contact the Windows Active Directory. The error was:
- Failed to contact the Schema Master server for this Active Directory forest."

I was about to go through the manual steps to remove Exchange but this server is also their FTP server so removing and re-adding IIS is a problem.  Any suggestions??

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jagard29Author Commented:
We're going to discuss taking the server down for an hour, adding it to the domain to uninstall exchange and then putting it back in DMZ.  I'll let you know if this resolves issue.
jagard29Author Commented:
It was resolved by getting the client to agree to having the FTP server be unavailable for an hour while we moved the server to the LAN to do the Exchange uninstall.

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