Microsoft relesed preview builds from the Microsoft Edge Canary channel available on Windows 7, Windows 8, and Windows 8.1. This rounds out the initial set of platforms that Microsoft began to roll out back in April, so developers and users alike can try out the next version of Microsoft Edge on every major desktop platform.

Microsoft Edge preview builds for Windows 7, Windows 8, and Windows 8.1

I find it interesting that Microsoft would even back-port Edge to something like Windows 7 considering the death clock is ticking, but perhaps there's a bit of an agenda behind it, to try and get people to like Edge and convince them that upgrading to Windows 10 won't be as horrible as others say.