Microsoft has announced a new "cloud PC" product where users can stream a Windows device from anywhere.
Windows 365 will work similarly to game streaming - where the computing is done in a data centre somewhere remotely and streamed to a device.
That means all sorts of devices - including tablets or Apple Macs - can stream a full Windows desktop PC.
It is being sold to businesses to begin with, as many firms move to a mix of office and remote working.
Microsoft is marketing the new way of using a PC as "hybrid Windows for a hybrid world".
The company says that every user's apps and settings will boot instantly from any device - allowing personalised Windows PCs to be accessed from anywhere.
It will launch in August for business customers "of all sizes", Microsoft said. To begin with, it will stream a version of Windows 10 - but the successor, Windows 11, will also be available once it launches.
There is no news on whether a personal product will follow. However, Microsoft has been moving towards a subscription model for its man services for nearly a decade.