Exchange Routing Groups

Routing groups are used to provide communication between to Exchange servers - typically between two different versions of Exchange e.g. Exchange 2010 and Exchange 2003.

The two servers that form the source and destination of the routing are reffered to as 'bridgehead servers'.

In order to view information about current routing groups we can use:

Get-RoutingGroupConnector | FL

Routing group connectors are unidrectional routes between two bridgehead servers i.e. a seperate routing group has to be defined for both incoming and outgoing mail.

In the event of a post migration the task of removing the old Exchange server would require removing any redundent routing groups with something like:

Remove-RoutingGroupConnector "My Routing Group"

Just like send connectors routing group connectors also have a cost associated with them allowing you to specify preferred routes.