Following the successful launch of Windows 10 operating system world wide, Microsoft have quietly updated their life cycle page. From what we saw, Microsoft already ended mainstream support for Windows 7 PC’s on the 13th of January, 2015. Extended support for Windows 7 PC’s ends January 14th, 2020. Quite a long time.
The more interesting news is that starting 31st of October 2016, OEM’s will stop shipping new computers with Windows 7 pre-intstalled. Retail software sales for Windows 8 and 8.1 is already ended to pave way for the new Windows 10. You can find the full details in the source link.