Bit by bit, Microsoft is rolling out its new Windows 8 operating system. Last week, it was released to manufacturers and Action Pack subscribers got their hands on it Monday.
Microsoft announced the deal - a promise it made in May - in a Tweet Monday.
"The @Windows upgrade offer is now available in 140 countries," it read. "Register now! http://windowsupgradeoffer.com."
Windows 8 upgrade deal details
The offer is good through February 28, 2013. If you miss the deal, you'll have to pay full price - though no word yet on what that will be.
Deal getters will need their 25-digit Windows 7 product key to make it through the online registration process.
Microsoft plans to send out email promo codes beginning October 26 that can be used during online checkout.