You cannot log on to Exchange 2000 Server with UPN logon method

When you log on to Microsoft Exchange 2000 Server with Outlook 2002 or Outlook 2000, you cannot use the user principle name (UPN) logon method (for example, user@company.com).

When None is used as the authentication method in a Microsoft Outlook profile, a logon dialog box is generated. This dialog box prompts the user for user name, password, and domain. If you type user@... for the user name, the at sign is supposed to disable the domain field, so that the user fills in only the user name and password for the UPN logon method. However, this does not happen.

Outlook 2002

To resolve this problem, obtain the latest service pack for Microsoft Office XP. For additional information, click the following article number to view the article in the Microsoft Knowledge Base: The English-language version of this fix should have the following file attributes or later:

Outlook 2000

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language. The English version of this fix should have the following file attributes or later:

Outlook 2002

Microsoft has confirmed that this is a problem in Outlook 2002. This problem was first corrected in Microsoft Office XP Service Pack 1.

Outlook 2000

Microsoft has confirmed that this is a problem in Outlook 2000.

After the appropriate hotfix is applied, this problem will no longer occur on computers that are running Microsoft Windows 98, Microsoft Windows Millennium Edition (Me), Microsoft Windows 2000, and Microsoft Windows XP. However, the hotfix will not correct the problem on Microsoft Windows NT Workstations.