DOS 5 Upgrade Video
Every now and then I stumble on something so ridiculous that I have to share it. This is a promotion video to upgrade to DOS 5 obviously made in a different era. Promoting features like mouse support, a graphical shell, and freeing up at LEAST 45k of memory, well, Gimme 5! Did I mention that it's all set to a hip beat? You'll love it. And by "Love" I mean "Stick forks in your eyes".
I bet MS didn't plan on it sticking around quite as long as that when they made that video!
Best DOS ever was DOS 6.20. However that contained the pirated Stak data compression software, which is why DOS 6.22 was released - to replace the better compression of 6.20 with the sucky MS-made compression in 6.22. (DOS 6.21 was like Windows XP N - Same as DOS 6.20 but with NO compression)
http://en.wikipedia.org/wiki/MS-DOS#Legal_issues