XADM: Public Folder Store Cannot Mount with Error c1041722

In a Mixed mode environment, where an Exchange 2000 server is installed into a "pure" Administrative Group (not an upgrade from Exchange Server 5.5), the public folder store may not mount. When you try to mount the Messaging Application Programming Interface (MAPI) public store, you may receive the following error message: Events that are similar to the following events may also be logged in the Application event log:

This issue can occur if the Active Directory objects of the servers that own the public folder trees (including the Active Directory objects of Exchange Server 5.5 computers) do not have correctly configured permissions.

To resolve this issue, make sure that the Exchange Domain Servers group (of the domain in which you are trying to mount the Exchange 2000 MAPI Public Folder Store) has Full Control permissions on the server objects in Active Directory.

To check and change the permissions on the server objects, you need to use ADSI Edit.

WARNING: If you use the ADSI Edit snap-in, the LDP utility, or any other LDAP version 3 client, and you incorrectly modify the attributes of Active Directory objects, you can cause serious problems. These problems may require you to reinstall Microsoft Windows 2000 Server, Microsoft Exchange 2000 Server, or both. Microsoft cannot guarantee that problems that occur if you incorrectly modify Active Directory object attributes can be solved. Modify these attributes at your own risk.

To check and change the permissions on the server objects:

1.	Start ADSI Edit, locate the Configuration container, and then locate (where org_name is the name of your Exchange organization, AG_name is the name of the Administrative Group, and Server1 and Server2 are the names of Exchange computers): CN=Services, CN=Microsoft Exchange, CN=org_name, CN=Administrative Groups, CN=AG_name, CN=Servers, CN=Server1, CN=Server2, and so on
2.	Make sure that the Allow inheritable permissions from parent to propagate to this object check box is selected.
3.	Click the Security tab, make sure that the Exchange Domain Servers group in the domain of your Exchange 2000 server has Full Control permissions on the servers that host the public folder hierarchy.

When a public folder store is being mounted, the Exchange Domain Servers group requires Full Control permissions on all of the servers that "own" the public folder hierarchy. The servers that own the public folder hierarchy are listed under the msExchOwningPFTreeBL attribute. Because Exchange Server 5.5 hosted the public folder hierarchy before an Exchange 2000 server joined the organization, an additional object is displayed under the CN=Folder Hierarchies object that references the Exchange Server 5.5 public folder hierarchy: An Exchange Server 5.5 computer that is upgraded to Exchange 2000 also has CN=Public Information Store. Notice that this is different from, which references a new installation of Exchange 2000 server: