BlackBerry can communicate directly with Exchange 2007. I'd show your IT guy this link at the bottom of my post because it's always much more desirable to be connected to your corporate emails via BES rather than BIS due to all the extra functionality you get.
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RIM has planned for and now certified support of Exchange 2007 with BlackBerry Enterprise Server. This initiative involved an update in software to the following product release:
BlackBerry Enterprise Server v4.1.3 for Microsoft Exchange The mode of full support and certification as it relates to compatibility with Exchange 2007. Please be advised that with this release, RIM has issued the software with all of the acceptance criteria being met, thus deeming the software certifiably compatible.
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BlackBerry - BlackBerry Enterprise Server Support for Microsoft Exchange Server 2007