Upgrade to Windows 10 for FREE!
Yes, you read it right! Microsoft will be offering a free upgrade to users of Windows 7, 8 & 8.1 later this year.
The offer will only be open for a year after which you'd have to paid to upgrade and doesn't apply to new sales of Windows 10.
Keep watching the news for when this offer starts, it'll be a few months yet or so I'm lead to believe.