What is Direct Push

What is Direct Push? What are the requirements to run it?
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LANm0nk3yConnect With a Mentor Commented:
"Direct Push is a client initiated HTTP connection to the server where the device opens a connection to the Exchange Server and keeps it alive for a duration known as the heartbeat interval.  Basically the client sets up the connection, chooses the appropriate heartbeat interval and tears down and reestablishes the connection if and when necessary. The server sends notifications about new items over this connection and the client synchronizes to get the new items."

Requirement is that the server in ables it, and a mobile device that supports it.
Exchange 2003 SP2 supports this
Exchange 2007 supports this out of the box.
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