This PDF from Raymond Chen (I don't know the source material) is a great example of the lengths the Windows team had to go to to maintain backwards compatibilit

This PDF from Raymond Chen (I don't know the source material) is a great example of the lengths the Windows team had to go to to maintain backwards compatibility between Windows versions. They spent an inordinate amount of time either working directly with application developers or, when that wasn't an option, changing Windows internals specifically to keep problematic Windows apps working. http://ptgmedia.pearsoncmg.com/images/9780321440303/samplechapter/Chen_bonus_ch01.pdf http://ptgmedia.pearsoncmg.com/images/9780321440303/samplech...