Windows 2013

Windows 2013 would be released on December 21, 2012

Builds
Build 7487                                                                            Leaked on November 7, 2011

Build 7500                                                                            Leaked on December 15, 2011

Build 7515                                                                            Leaked on December 23, 2011

Build 7601                                                                            Leaked on January 10, 2011

Build 7700 - Developer Preview                                                                                                                          Released on February 22, 2011

Build 7903 - Consumer Preview                                                                                                                          Released on April 2, 2011

Build 8035 - Release Preview                                                                                                                              Released on June 15, 2011

Build 8045 - Pre RC                                                                                                                                              Leaked on July 6, 2011

Build 8060 RC1                                                                                                                                                     Released on August 1, 2011

Build 8078 RC2                                                                                                                                                      Released on September 13, 2011

Build 9000 - RTM