I uninstalled Exchage 2000 from an old server, demoted it and removed it from a single domain site, I then promoted a new Dell server (Windows Server 2008 R2 SP1) as a DC to this domain. Then installed Exchange 2010 Std. with SP1. Installation went great. I then created a Public folder database which mounted fine. However, clents do not see the public folder. When I go the the Public Folder Management and select either "Public Folder" or "System Folder" I get a "Multiple MAPI public folder trees were found" error. I have checked the default public folder setting and used asdiedit and checked for multiple msExchPFTTreeType objects but can only find one. Infact there is only one "Public Folders" objects under Configuration, Services, Microsoft Exchange, First Organization, Administration Groups, Exchange Administration Group, Folder Hierarchies object. Any ideas as to what might be causing this? Thanks in advance for your time!

Do you have another administrative group under Administrative Groups?Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."

No, only CN=Exchange Administrative Group. However I have CN=Active Directory Connections and CN=First Organization objects under CN=CN=Microsoft Echange. the "Active Directory Connections has no objects under it. My test server does NOT have this object.

Do you have anything in Exchange yet? If not, you can remove the entire Exchange organization and start over if you want. In this article: http://support.microsoft.com/kb/833396 it's the last procedure, Recommended action if you receive an error when you try to reinstall Exchange Server 2003. I recommend that you remove Exchange 2010 from the server before following this procedure to make it easier to install it later. Also, consider installing Exchange 2010 on a member server, not a domain controller. Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."

Thanks for the reply. I contacted MS Support and they found a reference to the Exchange 2000 Public Folders at the CN=Microsoft Echange contanter. Removed it and the error was gone and Public Folders are now operational. Again Thanks!