Microsoft are offering a free upgrade to Windows 10 from W7 & W8, even if you are using a pirated copy (you naughty people). Available for 12 months from it`s release, I`ve been able to avoid W8 but I might give it a go seen as it`s free.
"Free Upgrade Offer*
Great news! We will offer a free upgrade to Windows 10 for qualified new or existing Windows 7, Windows 8.1 and Windows Phone 8.1 devices that upgrade in the first year! And even better: once a qualified Windows device is upgraded to Windows 10, we will continue to keep it up to date for the supported lifetime of the device, keeping it more secure, and introducing new features and functionality over time – for no additional charge. Sign up with your email today, and we will send you more information about Windows 10 and the upgrade offer in the coming months"
Windows 10 - Microsoft Windows