Event ID 4003 is logged and the Free/Busy replication from an Exchange Server 2003 server to an Exchange Server 2010 server fails

Applies to: Exchange Server 2010 EnterpriseExchange Server 2010 Standard


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.


To resolve this problem, install the following update rollup:
982639 Description of Update Rollup 4 for Exchange Server 2010


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