There was some confusion, however, when Microsoft's Terry Myerson started talking about Windows 10 "as a service." Did that mean that
after that first year of free availability, Windows 10 would cost an annual fee?
I asked Myerson for clarification after the presentation, and he confirmed that there will be no additional fees attached to Windows 10, whenever you buy it.
Myerson clarified that Windows 10 users will still get free updates and support for the lifetime of the OS, exactly like past versions of Windows (like XP and Windows 7's Service Packs, for example).
There's no subscription model for updates or support or continuing to use the OS. Myerson's reference to Windows "as a service" simply meant that Microsoft plans to update the OS with smaller, more regular updates rather than the big, chunky updates of past Service Packs.
A year after Windows 10 is first available, it will no longer be a free upgrade for Windows 7 and 8 users. Microsoft will then sell Windows 10 the same way it has sold past versions of Windows. MS hasn't set a specific price yet, but Myerson said the price will likely be comparable to past versions of Windows. Windows 8 costs $120 on Amazon, for instance.
Source:
http://www.pcgamer.com/microsoft-windows-10-will-not-be-sold-as-a-subscription/
