As of 1st December, it appears that Forefront 2010 for Exchange 2010 is discontinued (although supported until 2015) - http://blogs.technet.com/b/server-cloud/archive/2012/09/12/important-changes-to-forefront-product-roadmaps.aspx
What do others recommend as a replacement for installing on internal HUB transport and mailbox servers? Do Microsoft offer alternative solutions that you are aware of? We have external cloud-hosted AV and spam filtering, so this is purely about the antivirus protection from internal clients and servers or people with BYO devices...