Active Directory user accounts have multiple X.400 proxy addresses after the Exchange 2000 Recipient Update Service runs

After the Microsoft Exchange 2000 Recipient Update Service (RUS) runs, Active Directory user accounts may have multiple X.400 addresses.

This problem occurs when you modify the last 5 characters of the Last Name attribute of an Active Directory user account, where the Last Name attribute contains 40 or more identical characters. In this scenario, the Exchange 2000 proxy validation process may not be able to interpret the current X.400 address as valid for the user account, and therefore it creates a new X.400 address for the Active Directory user account.

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 hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.Note Because of file dependencies, this update requires Exchange 2000 Server Service Pack 3 (SP3). For more information, click the following article number to view the article in the Microsoft Knowledge Base:

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.