I work for a startup that supplies enterprise systems to some very large companies that are still on IE6. In my view, when these companies refuse to upgrade it

I work for a startup that supplies enterprise systems to some very large companies that are still on IE6. In my view, when these companies refuse to upgrade it's a way of pushing (very real and substantial) costs onto us. We're now at the point where our starting position in sales negotiation is that we require IE7, if potential customers don't like it it's a negotiating point. If we really had to we'd support IE6, but we'll look to recover those costs in license/support fees. Ultimately, this is good for the industry. Until companies like us start attaching a visible cost to IE6 support, these departments will not upgrade.