Engadget posted a story that Microsoft will released four edition of Windows Server 2012

Microsoft has been devoting most of its OS update attention this year to Windows 8, not its suit-wearing Windows Server 2012 counterpart. Some of the mystery has been cleared up through word of a greatly simplified server OS lineup. Just four versions of Windows Server will sit in IT backrooms versus the whopping 12 from Server 2008 R2, with an emphasis on making the feature slope a little gentler. The biggest improvement is the near-identical feature set of Windows Server 2012 Standard compared to its Datacenter equivalent: the only advantage of Datacenter is the jump to unlimited virtual machines, giving smaller businesses a way to save some cash.

  Windows Server 2012 pares back to four versions