Ask the Expert

Installing Microsoft Outlook on Exchange Server 2003

I accidentally installed Microsoft Outlook on Exchange Server 2003. Now 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 must be corrupted. Can you tell me how to fix this problem?

    Requires Free Membership to View

Installing Microsoft Outlook on Exchange Server is not recommended or supported. Exchange Server installs a copy of MAPI32.DLL file in the %systemroot%\system32 folder. Microsoft Outlook installs its own version of MAPI32.DLL in a different location in the program files folder, and installs a stub version in the location where Exchange Server expects to find it. This may continue to work for any length of time, but it is an unsupported configuration. Additionally, it may break some other programs that rely on MAPI.

You should uninstall Microsoft Outlook from the Exchange Server, then run Exchange setup and select the reinstall option.

Do you have comments on this Ask the Expert Q&A? Let us know.

Related information from

  • Tip: Exchange and Outlook shouldn't share
  • Tip: Common Outlook DLL errors
  • Tip: Microsoft Outlook without Exchange Server
  • Learning Center: The Microsoft Outlook Toolbox
  • Reference Center: Microsoft Outlook tips and resources
  • Reference Center: MAPl tips and resources
  • This was first published in June 2006

    There are Comments. Add yours.

    TIP: Want to include a code block in your comment? Use <pre> or <code> tags around the desired text. Ex: <code>insert code</code>

    REGISTER or login:

    Forgot Password?
    By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy
    Sort by: OldestNewest

    Forgot Password?

    No problem! Submit your e-mail address below. We'll send you an email containing your password.

    Your password has been sent to: