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Receiving MAPI error after uninstalling Outlook on SBS and Exchange

A user is unable to rebuild the global default address book after installing, and then promptly uninstalling, Outlook 2003 on SBS and Exchange, which is not supported.

I installed Outlook 2003 on Small Business Server and Exchange Server. I didn't know that I wasn't supposed to do this. Now I have uninstalled Outlook from the servers, but I'm having problems -- when I try to rebuild the default global address list, I get the error "MAPI or an unspecified service provider." I think my MAPI profile may be corrupted. How can I fix this?
Backup first and then reinstall Exchange over the existing installation.

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