Streaming sites and airline site(s) I've worked on had to support at least IE11 because we were getting a lot of hits from IE. The interesting thing is that most purchases came from Chrome/Safari but we still had enough visits from IE so that PMs could justify supporting it.
Right now, I'm starting to miss IE11 quirks and issues as the current application I'm working on must support some ancient WebKit/Safari 6. FML...
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