Apr 12, 2015

Why is it called Windows 10 and not Windows 9?

Why is it called Windows 10 and not Windows 9?

Now that Windows 10 development is in full swing, with the new Spartan browser and new Technical Preview builds appearing on a regular basis, let’s take a step back for a moment and address one of the most confusing things about the next version of Windows. When Microsoft announced its newest operating system, the surprise was not that it was coming, but that Windows would be skipping 9 and heading straight to 10. When asked about Windows 10’s name, Microsoft never gave a clear answer. So why, exactly, is Windows 10 getting the nod instead of 9?



Version numbers, schmersion numbers

You may remember that between Windows 3 and Windows 7, versions of Windows were designated by a name rather than a number: 95, 98, NT, Me, 2000, Vista, and so on. When Microsoft announced Windows 7, there was actually a similar amount of disbelief; after a series of named versions of Windows, it seemed odd to jump back to numbers.

There’s also the fact that the name of each Windows release doesn’t actually match the real version number. For example, Windows 8.1 is actually version 6.3 of Windows. Windows 10 is version 6.4. The last time the release name actually matched the version number was the enterprise-focused Windows NT 4.0, which was released back in 1996. Windows 2000, which was called NT 5.0 during development, was actually version 5.0. Windows XP was version 5.1. Windows Vista was 6.0, Windows 7 was 6.1, Windows 8 was 6.2, and Windows 8.1 is version 6.3.

Windows RT, which only ran Metro apps, was a new and separate beast, but it still sat on top of the core Windows NT kernel. It’s dead now.

Technically, modern versions of Windows are still based on the Vista kernel and code base — including Windows 10, which is actually Windows 6.4. There will be some confusion if (or when) we eventually reach internal version 7.0, but we’ll cross that bridge when we get there.

Alternative theories for skipping Windows 9

First, Someone says in that 9 number is consider unlucky in Japan..
Microsoft has a big enough presence in Japan that it may have skipped Windows 9 to avoid any weirdness or ill will. Benny says that Trend Micro — a Japanese company — did the same thing a few years ago when it skipped version 9 of its antivirus software.



Second, someone purporting to be a Microsoft developer posted this comment on Reddit:


As dumb and yet amazing as this sounds, it is actually quite feasible that there are still a lot of legacy Desktop apps that use this method (or something similar) to check for Windows 95 or 98. Bear in mind that this is just an example piece of code — some developers will check for the OS name (“Windows…”), some will check for the version number (as discussed in the previous section of this story), and some may use other methods entirely to find out what OS the app is running on.

What’s in a name?

Ultimately, Windows 10 is just a name. Windows 9 probably would’ve made more sense — and it’s going to cause some grief with novice users who just don’t understand what happened to Windows 9. But Windows 10 isn’t any more right or wrong than calling Vista’s successor Windows 7.



A better question to ask now: Why did Microsoft call it Windows 10 specifically, and not something else? During the unveil event (video embedded above) Myerson gives us a few clues. Starting at around the 2:10 mark, he says: “We know, based on the product that’s coming, and just how different our approach will be overall, it wouldn’t be right to call it Windows 9.” He then talks about how Windows One would make sense with Xbox One, OneDrive, and OneNote, “but unfortunately Windows 1 has been done by the giants that came before us.” And so it seems the only other viable option was Windows 10.


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