Exchange 2010 RTM Release Update 1
You can download from here: https://www.microsoft.com/downloads/details.aspx?FamilyID=371add31-d7a0-4c8b-8325-a6fced2d05e6&displaylang=en
This rollup includes changes required to support BlackBerry® Enterprise Server against Exchange Server 2010. More information here: Exchange Team Blog.