This problem occurs because Exchange Server 2010 validation fails on the RPC Client Access service. The validation fails if the replication item is located in the root folder.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Article ID: 981961 - Last Review: Nov 11, 2011 - Revision: 1
Exchange Server 2010 Enterprise, Exchange Server 2010 Standard