Browser-specific public sites are antithetical to the nature of the Web, completely missing the point.

You might try sending this link to any of the bean counters that webmaster reports to:

There the manager will see that 67.69% of potential visitors are being prevented from using the company's site by the webmaster's decision to rely on IE-specific tags.

After sending the link, give it about two days for internal corrective action, then try the site again.