Microsoft has unveiled the next generation of its Windows software, called Windows 11, that has a new “start menu” and other features. The newest version of Microsoft’s flagship operating system announced Thursday will be a successor to today’s Windows 10, which the company introduced in 2015. Windows 11 is expected to become available later this on new computers and other devices and as a free update for those with Windows 10. In a challenge to rival Apple, the company also announced that it won’t force app developers to pay fees to Microsoft for using its app store.