Routing Group connectors in Exchange 2003

When you're removing Exchange 2003 servers in an Exchange 2010 organization, one of the steps is removing the routing group connector which connects the 2003 and 2010 administrative groups. When going to the 2003 ESM to do so you'll probably see one or more other connectors there as well. Before removing the last Exchange 2003 server you should remove the other routing group connectors in your 2003 administrative group. If you don't your 2010 transport server will still see the connector but won't see a route to it, and will start logging errors 5015 and 5016 and warning 5006.

Fortuantely, if you've already uninstalled your last 2003 server without removing those connectors and are receiving those warnings and errors, you can simply remove the old connector from the "Send Connectors" tab under the "Hub Transport" organization configuration in 2010 EMC.