Longhorn Beta 1 Milestone 9 (Beta 1 M9) and platform code complete*
March 16, 2005
Note: The "platform code complete" designation does not mean that the Longhorn feature set will in any way be finalized by this point in time. Instead, this term refers to an internal "quality gate" that Longhorn builds must pass in order for the project to be moved into the main build labs for wider distribution.
Longhorn Beta 1
May 25, 2005
Longhorn Beta 2
October 12, 2005
Longhorn Client Release Candidate 0 (RC0)
February 22, 2006
Longhorn Client Release Candidate 1 (RC1)
Longhorn Client release to manufacturing (RTM)
May 24, 2006
Longhorn Launch (widespread public availability)
Summer 2006 to October 2006, depending on release schedules for other Longhorn wave products.
Longhorn Server RTM/Longhorn Client SP1 RTM
Second half of 2006/first half of 2007 (Client RTM + 6 months)