@mgiambanco While this question is not about "production" (at least there is no hint in the question), Microsoft officially only supports IE11, so it does not make a whole lot of sense to still produce software for products without official support. Hence I recommend not using jQuery and stick to modern standards instead.
I know that in certain industries, there is still WinCE5, Windows XP, etc. running. But I think that's not the norm when asking questions about web development here :)