Windows 10, Microsoft’s new operating system, launches July 29. The biggest difference between it and older versions of Windows? It’s a totally free upgrade — provided you have Windows already installed on your computer.

That’s a big change for Microsoft, which could traditionally count on big sales of its latest operating systems. It’s also a shift that’s emblematic of larger changes at the company under CEO Satya Nadella, who’s moving many of Microsoft’s software products to subscription-based sales models.

For more about Microsoft’s Windows 10, watch the Tech Time video above.

Read next: Microsoft Is Using Cute Babies to Sell Windows 10

Download TIME’s mobile app for iOS to have your world explained wherever you go

Write to Alex Fitzpatrick at and Arpita Aneja at

Read More From TIME