Designing Message Transport During Coexistence with Exchange Server 2007

A issue that coexists between the two Exchange server versions is message transport. Message transport coexistence is configured automatically, provided the correct versions of Hub Transport servers are available.

Message Routing During Coexistence

As you deploy Exchange Server 2010 Hub Transport and Mailbox servers in an Exchange 2007 organization, message transport works as follows:

Each version of Exchange Mailbox server must use an equivalent version of the Hub Transport server when routing messages within the same site. Consequently, you must deploy the Exchange Server 2010 Hub Transport server before deploying the Exchange Server 2010 Mailbox servers. Additionally, you must not remove the last Exchange Server 2007 Hub Transport server until you have removed all of the mailboxes from the Exchange Server 2007 Mailbox servers.

If you have both Exchange Server 2007 and Exchange Server 2010 servers deployed in a site, messages flow from the Exchange Server 2010 Mailbox server to the Exchange Server 2010 Hub Transport server, to the Exchange Server 2007 Hub Transport server, and then to the Exchange Server 2007 Mailbox server. Messages sent from an Exchange Server 2007 mailbox follow the reverse route.

Message routing between Active Directory sites can use Hub Transport servers on either version of Exchange Server. If you installed an Exchange Server 2010 Hub Transport server in one site, it can send messages to Exchange Server 2007 Hub Transport servers in another site.

Message routing to and from the Internet can use either Exchange Server 2007 or Exchange Server 2010 Edge Transport servers. If your current deployment uses Exchange Server 2007 Edge Transport servers for inbound e-mail, you can continue to have the Edge Transport servers forward all messages to the Exchange Server 2007 Hub Transport server. For outbound messages, you can add Exchange Server 2010 Hub Transport servers to the SMTP Send connector that is responsible for sending messages to the Internet. This enables outbound messages to be sent through either Exchange Server 2007 or Exchange Server 2010 Hub Transport servers.

Edge Transport Server Coexistence

If you have deployed the Exchange Server 2007 Edge Transport server role, you can retain or replace these servers with Exchange Server 2010 Edge Transport servers.

You can implement edge synchronization between Exchange Server 2010 Hub Transport servers and Exchange Server 2007 Edge Transport servers, but you cannot configure edge synchronization between Exchange Server 2007 Hub Transport servers and Exchange Server 2010 Edge Transport servers. This means that if you are using edge synchronization, you should not deploy an Exchange Server 2010 Edge Transport server before deploying at least one Exchange Server 2010 Hub Transport server in the adjacent Active Directory site.

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