If you look at the ssllabs analysis, they already fail in IE 6 handshake simulation. Offhand I can't say if support for older browser is incompatible with more modern ciphers and protocols.
Brian from Backblaze here. Why do we get a bad grade for not talking with IE6? I'm honestly curious... I thought anybody who supported IE6 should be downgraded, because IE6 was end of lifed, inherently using it is a bad bad bad thing. It is literally safer to not use it than use it, right?
I don't think it's even possible to run IE6 on Windows Vista or Windows 7 or Windows 8, but I'm not entirely sure of that.
The intermediate suite (default) says: "Firefox 1, Chrome 1, IE 7, Opera 5 and Safari 1. "
The "Old backward compatibility" has IE6, but it also has SSL3, which is really not recommended.
