BlackBerry® Enterprise Server v5.0 with Service Pack 1 and Maintenance Release 1 is now fully certified with Microsoft® Exchange 2010 and BlackBerry® Technical Support Services are readily available.

All existing BlackBerry Enterprise Server customers running v5.0 are eligible for this maintenance release at no cost. Download Service Pack 1 and Maintenance Release 1 for BlackBerry® Enterprise Server for Microsoft® Exchange v5.0

Solution Requirements

• BlackBerry Enterprise Server v5.0 with Service Pack 1 and Maintenance Release 1
  • Download service packs and maintenance releases for BlackBerry Enterprise Server v5.0

• Microsoft Exchange Server 2010 updated with Roll Up 1
  • Learn more about Microsoft Exchange Server 2010

• Microsoft MAPI/CDO Download Package
  • Download v6.5.8146 or higher of the Microsoft Exchange Server MAPI Client and Collaboration Data Objects 1.2.1

More info:
http://na.blackberry.com/eng/services/server/exchange/2010support.jsp