We know 13th Jan 2015 is the date when Microsoft's mainstream support for Windows 7 ended. Since then, Microsoft has continued to provide security updates for free and will do this until 14th Jan 2020 when Windows 7 extended support is going to end. As it has done with previous versions of Windows, the only people who will receive extended security updates (ESUs) after Jan 2020 will be those willing to pay for them.