How to decommission the only Exchange 2003 server

We would like to decommission an Exchange 2003 server. The server in question is the one and only Exchange 2003 server on a 2003 domain infrastructure. There are 2 other DC’s which are 2012, and will be used to fully upgrade the domain to 2012 at a later date.

E-mail has recently been migrated to 365 hosted e-mail with AD integration through DirSync.

All mailboxes have been deleted with the ‘SMTP’ and ‘System Attendant’ entries remaining (see attached screenshot - Exchange Mailboxes).

When I attempting to uninstall Exchange through the ‘Microsoft Exchange Wizard’ I receive an error indicating that ‘One or more users currently use a mailbox store on the server’ (see attached screenshot - Microsoft Exchange Installation Wizard).

In AD, there are a number of Exchange items that have e-mail addresses associated with them, but I assume that these will be removed when the Exchange installation is complete (see attached screenshot - Exchange AD Items)

Can anyone provide step by step instructions on how to decommission and remove the Exchange 2003 server from the domain?
Exchange MailboxesMicrosoft Exchange Installation WizardExchange AD Items
swan_solutionsAsked:
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Simon Butler (Sembee)ConsultantCommented:
Those additional items you have listed are public folders.

The error about mailboxes is quite common. With Exchange 2003, a mailbox isn't created until it is used for the first time, so you probably have a mail enabled object somewhere that needs to be mail disabled.
I have a method for finding them here:
http://exchange.sembee.info/2003/migration/unused-mailboxes.asp

Get rid of the mail enabled objects and Exchange should let you uninstall - it really is as simple as that.

Simon.

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swan_solutionsAuthor Commented:
Excellent, thanks for the link. It turned out that 6 user accounts had Exchange Attributes associated with them. Once the accounts were identified using the search parameters as described in the  link, I simply right clicked on them and selected 'remove Exchange Attributes'.

Thanks
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