 It provides response times similar to the push technology of RIM's BlackBerry service, but needs no special server upgrades other than having Exchange Server 2003 Service Pack 2.It works by initiating an HTTPS connection to the server through any connectivity that can carry an IP traffic such as GPRS or EDGE technologies, through the firewall, then a front-end server that connects to the Exchange server that hosts the user mailbox.It also eliminates the need for devices to have a dedicated IP address, but requires "Always on" GPRS or 3G connection.