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So now Google has said no to old browsers when can the rest of us follow suit?

Normally a SO browser but this question doesn't fit there, hopefully it fits here.

I just want to ask from web designers' point of view if it's wrong to not care about supporting Internet Explorer or older browsers.

The site I'm designing looks great in all browsers except IE9-. There are certain things that IE doesn't support or behave like other browsers; AJAX, JQuery, webkit stuff, some CSS styles, drop-and-drop files from OS etc etc, but it all works great in Safari, FireFox, Chrome etc.

Should I be that concerned? I know there are several people that use IE, but it's limitations have just been causing me more work by having to come up with workarounds. From what I've read, many of the issues I've been having should be solved with IE10, but not everybody keeps up to date. I know of several people who are still using IE6!

Again, I'm hoping this is the right place to ask a question like this, and if not, please point me to the right stack exchange site instead of just downvoting me.

Thanks!