Microsoft can't carry everything forward from release to release. Either from lack of use, replacement by newer technologies, or decisions to simply cease support, some features fall by the wayside of every release. In Windows Server 2012 R2 Preview, 64 features have either been deprecated or removed outright.

Features Removed or Deprecated in Windows Server 2012 R2 Preview

Sean writes about cloud identity, Microsoft hybrid identity, and whatever else he finds interesting at his blog on Enterprise Identity and on Twitter at @shorinsean.