Q. Is it OK to use the Standard edition of Exchange 2010 or Exchange 2007 for my Hub Transport servers and Client Access Servers if I'm using Enterprise edition for my mailbox servers?

A. Enterprise edition's primary difference over Standard edition is its ability to host 100 databases per server instead of five. The Client Access Server and Hub Transport server don't host any databases, so using Standard edition for those roles offers the same functionality as Enterprise. If you want to combine Hub Transport or Client Access Servers with mailbox servers and you need more than five databases, you need to use Enterprise edition.

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