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Running /domainprep a second time in Exchange 2003 environment

CompassIT
CompassIT asked
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Last Modified: 2007-12-19
I currently have multiple Exchange 2003 servers in 1 domain. I am currently decommissionin SERVERA and have installed SERVERB. I have moved all mailboxes from SERVERA to SERVERB. Upon uninstalling Exchange on SERVERA it states that RUS is still on the box. WHen i attempt to move RUS from A to B it gives me the following error "Before creating a recipient update service, a member of the domain admins security group inthe chosen domain must run exchanger server setup with the /domainprep command. ID NO. c1034a31. What would be the cause of this error? and would running /domainprep a second time pose a potential problem.
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Running domainprep a second time will not hurt an existing Exchange application. In fact, it's pretty commonly recommended as a troubleshooting step for squirrely permission problems. The most likely reason that Exchange is prompting you is that it cannot verify needed domain groups and permissions that it uses.  I assume you are also logged in with Domain Administrator and Exchange Administrator rights when you attempt to move this RUS.  In any case, you will need to be logged in with Domain Admin rights to run domainprep.

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Commented:
Exellent lollygagr . Is there perhaps a MS article that backsup you statement that running it a second time won't corrupt AD? Yes I am logged in with Exchange admin.
Here is a KB for an issue similar to yours where the recommended solution was to rerun domainprep: http://support.microsoft.com/kb/875300/en-us.  I can also vouch for it through multiple experiences of running it and forestprep to fix broken Exchange organizations.  It's not quite a silver bullet, but definitely has a place in the toolbox.  

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