i've created this blog as a storage for random tech notes i've found useful and may help others at the same time. i've joked that it's not possible to know everything but i'm google certified and can find just about anything i need using google. it's worked time and time again. anyway i hope you find this info useful if not that's fine too as it's really intended for me anyway :) -- google certified

Tuesday, October 18, 2011

removing exchange 2003, "One or more users currently use a mailbox store on this server"

Typically working with exchange is no problem for me but I ran into an environment where previously the organization had migrated to exchange 2010 but the old 2003 was not removed properly. Since they still had the old server there I fired it back up and began the process of uninstalling exchange. I verified all mailboxes were moved and so on and went to uninstall. The uninstall popped up a message saying there was still a mailbox on the server. This can happen if a user given an exchange mailbox but one is never created if they never logon to exchange or receive any email. The normal steps are to run some searches and I did but found nothing. I went as far as trying to remove the default mailbox database and still nothing. Finally I found a different query that worked and showed me the mailbox. To do the search, open ADUC, right click the domain, click find, click custom search, click the custom tab. In here type the following and modify for your environment.
The only items you need to change on this query is OrganizationName and ExchangeServerName

(msExchHomeServerName=/o=OrganizationName/ou=First Administrative Group/cn=Configuration/cn=Servers/cn=ExchangeServerName)(objectClass=User)

The above query should be one long line no returns.

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