I highly doubt this was the reason but there was a joke made in the keynote how Microsoft was naming things with "One" in them (XBox One, OneDrive, etc). The issue being that Windows One already exists and they cannot reuse it (28 years ago). Thus they wound up with 10.
User speculation came up with the reasoning that it's an extremely subtle snipe at Apple with their incredibly unstable and bad Mac System 9 OS (the predecesor to Mac OS X) and they want to level on with Mac OS X using the name Windows 10 (or Windows X).
[Edited by Neo7, 9/30/2014 10:37:54 PM]
Your bitterness, I will dispel
DABhand posted on Oct 01, 2014 12:11:23 AM - Report post
I wonder if it is because of the fact 9 is seen as a bad number in some Asian countries, like for example Japan.
Maybe it was to potentially boost sales?
Oh and Don't forget some tuts on ASM and defeating DMA
For me the same thing as on Vista has happened. They re-release a system which has only changed very slightly and call it the next big thing and people start to feel the same.
If you would compare Vista with Windows 7 you won't find any real difference except Windows 7 runs a bit smoother at start(!) but they had more than a year to polish it. Windows 10 is basically a Windows 8. They added the start menu and virtual desktops and that's it in general.
For me a system must be productive and not social based with a Bing search integrated. But I'm pretty sure they will use DirectX 12 to force a user base to upgrade. And once it's done people will start to accept it. However they had targeted the companies and I really wonder how they brand new idea of instant updates will look like for them. It's definitely not something a company wants to hear if they considering an upgrade. They prefer stable systems that works without compatibility issues.
@Dabhand: It's more like a marketing trick. "Hey look guys, it's Windows 10. It's so awesome and improved that it has nothing to do with Windows 8". They tried a fresh start without getting into trouble to be much compared with Windows 8. It should look like 'the brand new big thing'.