Hi, I have installed two CAS/HT servers in an array. I have two mbx servers that I'm going to put into a DAG. I don't seem to be able to send mail between the e2k10 servers and the e2k3 servers. When I look at the routing groups and run the command get-routinggroupconnector | Fl, the output is nada, zilch, zero. When I look in the ExchangeLegacyInterop group, there are no servers in there, although from this page: http://technet.microsoft.com/en-us/library/dd638103.aspx it would appear that my e2k3 server should be listed there. I installed my CAS and HT servers are installed on the same device and they were installed concurrently. I see send and receive connectors in the EMC, but that's it. Can anyone help me out?

Not sure why the routing group connector wasn't created by default. It should have with the first HUB server. No worries though. Your 2003 server does need to be a member of the Exhcange Legacy Interop Group. You can create the Routing Group Connector by running: New-RoutingGroupConnector -Name "Interop RGC" -SourceTransportServers "Ex2010Hub1.contoso.com" -TargetTransportServers "Ex2003BH1.contoso.com" -Cost 10 -Bidirectional $true -PublicFolderReferralsEnabled $true http://technet.microsoft.com/en-us/library/aa997292.aspxTim Harrington - Catapult Systems - http://HowDoUC.blogspot.com

Thanks for your help. One more question (hopefully): Should that command be run on each HT server or should I provide a comma delimited list of source server like: New-RoutingGroupConnector -Name "Interop RGC" -SourceTransportServers "Ex2010Hub1.contoso.com", "EX2010hub2.contoso.com" -TargetTransportServers "Ex2003BH1.contoso.com" -Cost 10 -Bidirectional $true -PublicFolderReferralsEnabled $true

Umm. Nevermind, I reread your post and noted the the two HT servers in there. Once this has been completed, I should be able to route messages from a 2k10 user to a 2k3 user as well as the reverse, correct?

That is correct...once this command is run, you will be able to route message back and forth. The routing connectors are viewable from the 2003 ESM. You will see one connector in each routing group. You will only see them on the 2010 side from the EMS. You can only modify them from the 2010 EMS side (like adding more hub servers to the connector). Tim Harrington - Catapult Systems - http://HowDoUC.blogspot.com