Exchange Server 2007 Deployment: 10 Tips When Installing: "In a coexistence scenario with Exchange 2007 and either Exchange 2003 or Exchange 2000, make sure your routing group connectors are configured correctly. By default, when you install the first Exchange 2007 Hub Transport server in an existing Exchange 2003 or Exchange 2000 organization, Setup creates a new routing group for all Exchange 2007 servers and requires you to specify an Exchange 2003 or Exchange 2000 bridgehead server to which it will connect the new Exchange 2007 routing group. By default, the Exchange 2007 routing group that is created is called the Exchange Routing Group (DWBGZMFD01QNBJR), and must not be renamed. Setup creates two reciprocal routing group connectors between the specified bridgehead server and the Hub Transport server that you are installing.
By default, you now have one Exchange 2007 routing group and two reciprocal routing group connectors between the first Hub Transport server that you installed and one bridgehead Exchange 2003 or Exchange 2000 server. You may want to consider creating additional routing group connectors. For redundancy, it is a good idea to connect additional Hub Transport servers in your Exchange 2007 routing group to the bridgehead servers in your Exchange 2003 or Exchange 2000 routing group. If your existing Exchange 2003 or Exchange 2000 organization had more than one routing group, you may want to consider installing the first Hub Transport server in the 'hub' Exchange 2003 or Exchange 2000 site. As you add more Hub Transport servers to different sites, you may want to create routing group connectors between these Hub Transport servers and the existing routing groups in other sites as well. This provides for a logical mail route between Exchange 2007 servers and legacy servers in different sites.
When Setup creates the initial routing group connector between the first Hub Transport server and the specified legacy bridgehead server, that legacy bridgehead server is automatically added to a universal security group (USG) called ExchangeLegacyInterop. Members of this USG have the permissions required to send e-mail to and receive e-mail from Exchange 2007. If you create additional routing group connectors between the Exchange 2007 routing group and routing groups from your existing Exchange 2003 or Exchange 2000 organization, you must use the New-RoutingGroupConnector cmdlet in the Exchange Management Shell. If you use this cmdlet, the Exchange 2003 or Exchange 2000 bridgehead server to which you connect will also be added to the ExchangeLegacyInterop.
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