Problem this snippet solves: Use the Exchange 2010/2013 template to provide additional security, performance, and availability for Exchange Server 2010 and Exchange Server 2013 Client Access Servers...
Sorry for the confusion, the fully supported version of 1.5.0 is on downloads.f5.com. This contains the latest updates, and replaces both release candidates: 1.5.0rc1 and 1.5.0.rc2.