Today Microsoft unveiled a new service called Windows 365 and it makes it possible for users to run a full version of Windows in a web browser on any device. The new service is only available for businesses at first, but given Microsoft's emphasis on cloud platforms it is highly likely that it will become available for consumers at some point in the future.

Link: Microsoft is bringing Windows to a web browser and it will work on iPad and the Mac
via 9to5mac.com