Windows 10 is free; that much we know. There was initially some confusion about the length of time for which this would be the case, but one of the biggest questions surrounding the giveaway has been 'why?'.
Is Microsoft aping Apple? Does the company feel that the operating system was not good enough to warrant a price tag?
The actual reason is rather interesting, and was revealed in an interview between Satya Nadella and ZDNet's Mary Jo Foley. This is not (really) a bid to compete with Apple, nor is it (particularly) meant to encourage as many people as possible to move away from Windows XP, Windows 7, and Windows 8.1 (although this will almost certainly be a happy side-effect). Rather it is a move to boost the profile of Windows Phone.
A large part of the move towards Windows 10 has been a drive towards a uniform, cross-platform experience. Using Windows 10 on a phone, computer, or games console should feel immediately familiar, and it turns out that phones are key to the pricing decision surrounding Windows 10. Mentioning the Windows Phone 'app gap' is very much treading old ground, but it’s something that Microsoft, like users and pundits, has noticed.
Creating an ecosystem in which universal apps can exist is central to the push of not only Windows 10 for desktops and laptops, but also Windows 10 for phones. Speaking to Foley, Nadella said: "The free upgrade for Windows 10 is meant to improve our phone position."
This is a slightly odd thing to say about an operating system that is, for the most part, destined for laptops and desktop computers.
In Windows 10, Microsoft is pushing the Store more than ever - something that clearly translates to phones as well as computers. It seems that the thinking is that by presenting the Store prominently, the hope appears to be that users will become used to the idea of downloading apps on one platform and, thanks to the presence of universal apps, titles that exist on the desktop will also be available for phones.
Will this give Windows Phone enough momentum to gain popularity? That's obviously something that remains to be seen, but Microsoft has said quite plainly that it has no plans to get out of the smartphone business.
Nadella is ambitious:
Microsoft is looking - with the help of, amongst other things, Continuum - to merge the mobile and the desktop.
Windows 10 is at the heart of that, and Nadella is pinning a good deal of hope on the idea that it will help to reinvigorate Windows on phones. Now Microsoft is playing the long game, and we'll just have to wait to see if it pays off.