Windows Blackcomb

Windows Blackcomb is the original codename of Windows 7 used from 2000-2005 and was later replaced by the codename of Windows Vienna from 2005-2008.
The Blackcomb project started development in July 2000. Microsoft planned that after Whistler was released, Blackcomb would be released in October at some point during the 2000s. Blackcomb was planned to be followed up both Windows Honeycomb (for Low End Machines) and Ballena (for High End Machines) during August 2000, however, both were cancelled. Honeycomb was cancelled for having far too many incompatible builds and Ballena for having various builds showcased illegally.
By October 2005, Blackcomb would be renamed to Vienna with development having been reset, and remained in development until July 22, 2009, when Windows 7 (the final release name) was officially released to manufacturers. 
== Builds ==
=== Pre-Delta Builds ===
Two builds of Blackcomb were showcased in a Computer Magazine from December 2000. These builds are known to be well before build 2468. The first build is dated from July 4, 2000. The second build is dated from October 8, 2000.
===Build 2468 ===
Delta release for Windows 7. Compiled on December 7, 2000. Released on April 3, 2001
===Build 2472 ===
Pre-Alpha release for Windows 7. Compiled on April 7, 2001. Released on May 1, 2001.
===Build 2477 ===
Pre-Alpha release for Windows 7. Not leaked. Released on May 4, 2001. Similar to many Windows XP Release Candidate 1 builds.
===Build 3570===
Known to exist from some build strings in later builds, this is considered to be Blackcomb Milestone 1. If such a build existed it would look like Windows XP in exact.
===Build 3826 (Milestone 2)===
Not leaked, but known to exist from screenshots. Has the XP Luna design.
===Build 3837 (Milestone 3)===
Not leaked, similar to 3826. The about screen is a screenshot called it 'Blackcomb XP Milestone 3'.
===Build 3906===
The earliest leaked build, compiled on November 10, 2002, and leaked on September 2, 2005. This version has the Plex user interface, similarly to Longhorn 3683.
===Build 4020 (Milestone 4)===
Compiled on February 5, 2003. Looks more like Longhorn 3718.
===Build 4106===
Compiled on April 4, 2003. Similar to Longhorn M4 builds.
===Build 4128===
Compiled on April 19, 2003. The first Blackcomb build to introduce the Desktop Composition Engine, it also has a different login screen to 4020 and 4106.
===Build 4137===
Screenshots have been seen; it seems to look like 4128 but is unleaked.
===Build 4196 (Milestone 5)===
Compiled on May 20, 2003 and leaked on June 16, 2003. Included the experimental Fire Classic visual style.
===Build 4204===
Compiled on June 1, 2003, also includes Fire Classic.
===Build 4257===
Compiled on June 28, 2003. This build was considered to be too unstable to be installed and despite the build being leaked, there isn't much known about it.
===Build 4276===
Alpha release for Windows 7. Compiled on July 14, 2003, this build defaults to XP Luna UI and Plex/Fire Classic can only be enabled in the registry. This build only surfaced on January 19, 2017.
===Build 4303 (Milestone 6)===
Compiled on August 2, 2003. This was one of the last known builds to include Plex as later on the visual styles would default to Fire Classic/Ice Classic/Slate/Jade.
===Build 4336 (PDC 2003)===
Compiled on October 17, 2003 and leaked on October 20, 2003. Similar to Longhorn 4051.
===Build 4357 (WinHEC 2003)===
Compiled on April 25, 2003 and leaked on May 2004. Similar to Longhorn 4074.
===Build 4383===
Compiled on May 6, 2004 and leaked on November 10, 2004. Similar to Longhorn 4083.
===Build 4393===
Compiled on August 19, 2004. Similar to Longhorn 4093.
===Build 4542 (WinHEC 2005)===
Compiled on April 1, 2005. Similar to Longhorn 5048.
===Build 4573 (PDC 2005)===
Last known Blackcomb build. Compiled on August 29, 2005. Similar to Windows Vista Beta 1.
==See also==
*Windows n-comb
Category:Fictional Windows versions