My sincere aolopgies, 2.0 can be a reference to the second or later versions of a software program. Microsoft likely did not start the practice of the naming convention by naming a major software upgrade or new release with a new whole number and subsequent "fixes" with fractional numbers hence 1.0 is first whole release and 1.1 to 1.9 are fixes (joke) meaning that by the time they get to 2.0 they have worked out all the little problems and have included a major new feature which will produce many new smaller conflicts requiring several small "fixes" only to start all over. It got so embarrassing at Microsoft (its amazing that they remain in business) that they changed from 2.0, 3.0 etc to using the "Year" as in their "Office" products and names as in their operating systems like "Windows". In any event, most companies don't get past 1.9 because they have caused so much trouble for their users and there is so much product out there that they loose the crowd and momentum.
"Doom", was the first truly huge mega hit and sold a lot of PC's to main stream households. It was built using "friends, family, and fools" money in a basement and sold just prior to its launch to a German outfit for several 100K (I think). The Doom was so wildly successful that the buyer gave the two developers 5 million and a room full of bean bag chairs, all the computer equipment you could imagine and a standing daily delivery of Cheese Doodles and Pepsi (specifically not Coke). The sequel was named Riven and was so popular that many such games came to life. The most successful one, Halo, which so cemented the "first person shooter" game as a staple, has been re-issued 4 or 5 times and is a multi-billion dollar franchise. It was the peak of the dot.com paper napkin millionaire era which I totally missed despite being in the middle of some of the best developers of the day.
