Taken from

http://na.blackberry.com/eng/deliverables/7335/New_BES_features_50_656131_11.jsp

Support for Microsoft SQL Server 2005 Express Edition

BlackBerry Enterprise Server version 5.0 supports Microsoft SQL Server 2005 Express Edition. The setup application can install Microsoft SQL Server 2005 Express Edition if your organization’s environment does not already include a database server.

Support for Windows Server® 2008

BlackBerry Enterprise Server version 5.0 supports Windows Server 2008.

Hell fucking yes!