Hello folks,
If you are experiencing a failure in the Hub Transport service and the eventid 5023 is appearing in your event viewer. Then, there is a new kb to fix it, check this out: http://support.microsoft.com/default.aspx?scid=kb;en-us;948000&sd=rss&spid=10926
Basically, the msExchHomeRoutingGroup attribute is empty and must be filled up with the value of the Exchange Server 2007 unique routing group name.
Best Regards,
Anderson Patricio
need help to resolve 5023 exchange 2013