Migrated to Exchange 2003, now unable to uninstall Exchange 2000

Posted on 2006-05-11
Last Modified: 2008-01-09

Hi Experts,
I've just finished migrating the company from Exchange 2000 to Exchange 2003 and was on the final steps of attempting to uninstall the Exchange 2000 server and experiencing a problem.

Up to this point I have:
-upgraded AD from 2000 to 2003
-added the new W2K3 server as domain controller / installed Exchange 2003
-completed all the prep work and moved users mailboxes
-Moved / Rehomed public folders
-Shut down services on old server and have run successfully for about a week now..

Used following whitepaper as a guide:

Now on the final step, attempting to uninstall Exchange 2000 and getting the following error:

"The component Microsoft Exchange Messaging and Collaboration services cannot be assigned the action of Remove because:
   One or more users currently use a mailbox store on this server. These users must be moved.............. "

The only 3 mailboxes I see left on the old exchange server are:
 - SMTP - %servername%
 - System Attendant
 - SystemMailbox

and their counterpart mailboxes ARE created and running on the new server, so not sure what to do or where to look at this point...


Question by:SflahertyEE
    LVL 104

    Accepted Solution

    This is not unusual.
    You could have a mailbox that is homed on that server in active directory, but has never had any items sent to it, so the mailbox hasn't been physically created.

    At the end of my migration page ( is a technique for finding anything that is still homed on the server. Follow that to identify any other accounts and then move them or strip them of their Exchange attributes.

    LVL 18

    Expert Comment

    Try this it will surely work:
    Just restart ur AD and exchange and u should be OK.If that is the only AD make sure to get another online as soon as possible.

    Author Comment


     Hi Sembee,
    Thank you for that link, that was the issue. There was a user mailbox created that never received any messages.
    So have removed that mailbox and run the de-install of Exchange successfully....I just have a few quick issues remaining...

    - all the exchange services seemed to have been removed except the MS Exchange Management svc

    - also, the eventvwr shows a recurring error:
          Event ID 12  Source - WinMgmt"Failed to CoGetClassObject for provider"
      "Exchange routing table provider. Class not registered[0x80040154]"

    - Then lastly, the directory structure from the previous install is still there. C:\program files\exchsrvr       as well as the mapping where we stored the info store and logs    D:\InfoStore            is it safe to delete those now?
    - Is there anything else I need to check to make sure the install happened and it has been recognized in AD/ESM?

    Thanks in advance,
    LVL 104

    Expert Comment

    You need to reboot the machine and see if that cleans up the service remains.
    The directory structure being left behind isn't unusual - you can simply delete it.


    Author Comment


     Hey Sembee,
    yup, that did it.. had rebooted the machine and service issues resolved themselves. Now the svcs no longer listed and the box has been cleanly removed from ESM on the new box as well.

    Thanks again for your help!


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