You still cannot replicate a public folder from one Microsoft Exchange Server 2010 server to another Exchange Server 2010 server even after you apply the update that is described in knowledge Base (KB) article 979921. Therefore, users who are on different servers see different public folders. Additionally, the following event is logged in the Application log:
Note This event is not logged if you set the diagnostic logging level to Lowest. To see the log entry for this event, you must set the public folder diagnostic logging level to Low, or to a higher level.