I no longer support any version of Internet Explorer prior to version 11. Microsoft has, as of today, ended their support for them. This means that no bug-fixes, compatibility fixes, and more important security updates will be forthcoming.
There is no longer any compelling reason to use one of these old browsers. Security alone should justify moving to IE11, Edge, or one of the other free browsers.
I pulled up the analytics of the sites I have access to. And after a quick bit of tabulation and some maths I can say that on average 3% of visitors to the sorts of sites I build use IE with a version number less than 11.
Who knows what proportion of that 3% actually convert to completing some goal. Frankly, it's not worth the effort supporting them.