Windows latest Windows 10 is coming on July 29th , If you have a Windows 7 or 8 on your pc or laptop then it will be a free update for you .This free update will last for 1 year , If after the update you wish to uninstall it then the license Microsoft is providing will allow you to clean install Windows 10 on the same device at any time.
The head of the Windows Insider program at Microsoft – Gabe Aul
For those who do not like upgrading their machines and prefer to clean install Windows every time a new version is released, this is good news for you. Gabe said the following on Twitter :
Once you upgrade W10 w/ the free upgrade offer you will able to clean reinstall Windows 10 on same device any time
The company is targeting to have one billion installs of the OS in the next 2-3 years, which means that they have to get users to upgrade quickly if they are going to meet this goal.