Microsoft released Windows Server (“Blue”) to MSDN subscribers today, ahead of the BUILD (#bldwin) conference later this week in San Francisco. The build provides us a number of clues as to what we will see in the official Windows 8.1 (Blue) preview. The server build number is 9341, the windows 8.1 preview build will be: 6.3.9431.winmain_bluemp.130615-1214. IE11 scores 351/500 + 2 bonus point, and 25/25 for WebGL. Since this is a server build, the score may be a little higher than IE11 on Win 8.1, but this confirms WebGL for IE11. IE11 WebGL Conformance Test Results: 14,748 of 20,509 tests pass (71.9%). Many things seen in the Server 2012 R2 preview will also show up in the Windows 8.1 preview.