Usually it's the other way around: companies stop supporting old browsers and support the current ones.
I still stand tall and proud by my statement not to develop for it as you shouldn't have to spend time getting websites to work in it when they should work like they do in IE 8, 7 & 6.
I would disagree but like most of our customers, I don't have access to IE9 for testing either... I'm just not paid enough to go buy a whole new operating system just to get a browser.
But anyway didn't I just read something in the CSS section? about 1.6.x and IE where the OP ended up dropping down to 1.5.x and IE magically worked?
All I remember is Paul O'B answered that thread.