Microsoft's Windows 10 operating system, set to be released on 29 July, will be available as a free upgrade for existing Windows 7 and 8.1 desktop users.
The earlier Windows 8.1 upgrade was made available for free as well as a patch for the beleaguered Windows 8, re-introducing the start menu and combining several features of Windows 7 and 8.
However, if you are a Windows XP user, you will need to buy the Windows 10 OS for around a £100 and better do it fast, as Microsoft has stopped supporting XP for over a year.
Post Windows 10, Microsoft will stop making Windows operating system and will invest actively on the new “Windows as a service” system through which updates will be rolled out regularly rather than in a comprehensive package.
Windows 10 will standardize Microsoft's ecosystem across PCs, tablets and smartphones, and will also debut Cortana and the new web browser named Edge across all devices. Additionally, Cortana will also be unveiled for iOS and Android devices.
Even though the official launch is just a couple of months away, Beta testing of the new operating system is still not complete, and Microsoft will be keen to avoid the embarrassment of the Windows Vista to return anytime soon.