Windows Foursquare

April 1995 - Microsoft starts developing Windows Foursquare.

May 1997 - There was planned to be a successor, but it was rejected, and they continued to develop Windows Foursquare.

November 1999 - 2 new sounds were introduced exclusively to Windows Foursquare. One is the startup sound, and the second is the shutdown sound.

2000 - Microsoft decided to combine Windows Odyssey, Windows Neptune and Windows Foursquare, but Foursquare was rejected from the merging and Microsoft continued developing Windows Foursquare.

July 2002 - Microsoft had to work on Blackcomb and Longhorn, so they suspended developing Foursquare for a moment.

November 2003 - Microsoft decided to come back to Foursquare. They began re-developing it in March 2004.

October 2005 - Microsoft suspended developing Foursquare once again, until May 2007.