He claimed that one of the reason that made Microsoft decide to use the version number 6 was the compatibility issue. Why has it anything to do with the compatibility? Well, apparently a lot of applications have their own version check built right in their software that checks the current platform to make sure their software runs on the OS they support. And most of them will deny to work if the version check returns the number that is not in their support range. However, because almost all applications that run on Vista without problem will essentially run just fine on Windows 7 too, making the version that is in the same series as Vista seems to solve this issue quite nicely.
It seems true from what I can see. At least, itâ€™s true that none of the Vista proved application has failed on my Windows 7. If there were any that check the version having the version 6.1 certainly has got them passed the version check part.