This article was previously published under Q311304
This article has been archived. It is offered "as is" and will no longer be updated.
When you mail enable an Exchange 2000 public folder, you may encounter duplicate public folder proxy objects in the directory for these public folders. A public folder proxy object is an entry in the directory that contains all of the mail-related attributes for the public folder (for example, e-mail addresses). If duplicate public folder proxy objects exist for a particular public folder, mail that is addressed to that public folder may not be delivered.
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:
Component: System attendant
Microsoft has confirmed that this is a problem in Microsoft Exchange 2000 Server.
After you upgrade an Exchange Server 5.5 computer to Exchange 2000, and then switch the organization to native mode, any attempt to mail enable a public folder (that was created in Exchange Server 5.5 before the upgrade) causes the creation of a duplicate public folder proxy object in the directory. Any public folder that you created on the Exchange Server 5.5 computer before the upgrade gives you the Mail Enable option. If you click Mail Enable to mail enable the folder, a second object is created in the Exchange System Objects container (in Active Directory).