One or more users currently use a mailbox store on this server - Migrating from Exchange 2003 to 2010

We have a client who is gettign rid of their 2003 Exchange server.  This is a good thing because 2010 is pretty good.  After following all the Migration steps here, i attempted to uninstall exchange 2003 and i got this message

"One or more users currently use a mailbox store on this server"

After a google i found this article from Microsoft.  If you discover that you have a regualr user (Not the SMTP User) then either move their mailbox or delete it/remove their Exchagne attributes.

Now in my case i had moved all users and none of the results i got helped me, until i found this article below.

http://msexchangetips.blogspot.com/2008/04/exchange-one-or-more-users-currently.html

So briefly, we use an advanced LDAP AD search to find users that have had exchange attributes added to their accounts but they have not opened their mailbox.

Below is the LDAP command with what you need to change in RED so you can get results:

(msExchHomeServerName=/O=myexchangeorgname/OU=myorgname/cn=Configuration/cn=Servers/cn=myexchangeserver)(objectClass=User)

Also make sure there are no spaces in the command.

-Fr33ze