2008
Halo Wars was made in 2009, along with Halo 3 ODST
After halo 1 and before halo 3
Yes, HALO 3 ODST and HALO REACH have been made
That depends which game you mean: Halo Combat Evolved, Halo 2, Halo 3, Halo 3: ODST, Halo Wars and Halo Wars were all made by Bungie, but they sold to 343 Industries last year. So far, 343 have only released Halo Combat Evolved Anniversary, which is a remestering of the very first Halo game, but Halo 4 is coming out this year, which 343 said will be the beginning of a brand new Halo trilogy.
Year 17
Halo Wars was made in 2009, along with Halo 3 ODST
Halo 3 has been out for ages now. the newest is halo ODST and halo reach is set to be out next year 2010
2007, shortly after Halo 2 PC was released earlier in the year
No only for the xbox (the first 2 are made for the xbox when halo odst, halo 3 , and halo reach are for the xbox 360)
Bungie
Halo 3 will not be able to get for PC because Microsoft stopped working with bungie cause bungie tryed to buy Microsoft abd made them made so no halo 3 for PC.