As you should know by now Exchange 2010 removes certain programming hinterfaces that breaks the likes of BES and Enterprise Vault. Found this:
October 20, 2009 – Research In Motion (RIM) is pleased to notify you that we are working in close collaboration with Microsoft on compatibility and support for BlackBerry® Enterprise Server for Microsoft® Exchange Server 2010. Compatibility is expected later this year. BlackBerry® Technical Support Services for BlackBerry Enterprise Server for Microsoft Exchange Server 2010 is expected within 30 days following the global availability of Microsoft Exchange Server 2010.
So GA for Exchange 2010 is expected at TechEd in Berlin