Looks like an iframe, probably to some third-party rebate processor.

That has servers running in debug mode..

Why would it be a surprise that Apple has computers running Windows? A lot of useful industry standard enterprise software is written in .NET

The bigger issue is that server displaying detailed errors to end users.

This looks fake...

It's real, but happened a few days ago. It's just an iframe loading a rebate provider's site (which is the site that had the error, not Apple's)

Apple.com runs Apache, so I know it's got to be another site. This thread title is a little misleading.