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

Summary: When uninstalling Exchange; you receive the following error message:


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


This can occur for multiple reasons:

1. There was a user in which the mailbox was never created because it was not activated ie. user never logged in or no mail was sent to it.

2. There is a user who has Exchange attributes but no mailbox referencing this server.


Resolution:

1. Start ADUC; click find.

2. Click custom search in drop down

3. Click Advanced tab

4. In LDAP field type:


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


Substitue o=myexchangeorgname and OU=myorgname and cn=myexchangeserver with your values. To find these values you can open adsiedit and go to the properties of a user and find the msexchhomeservername property.

One thing to note; if the query comes back with no results; copy the query into notepad. Close out the ADUC search and re-open it and paste the search query. I've noticed that the query does not work when pasting even though you remove all spaces unless you restart ADUC search.


James Chong (MVP)
MCITP | EMA; MCSE | M+, S+,
Security+, Project+, ITIL
msexchangetips.blogspot.com