You can migrate to the BlackBerry® Professional Software from BlackBerry® Enterprise Server xxx8211; Small Business Edition
Version 4.0 or later. If you have a small business solution that is earlier than Version 4.0, you must upgrade to Version 4.0
or later before you migrate to the BlackBerry Professional Software.
and it is free and more updated and supported by RIM
Also supports Exchange 2007, 4.0 does not.
BlackBerry Professional Free download