Journal: IE is not a web browser

IE is technically not a browser at all. To call something a "web browser" it must at least adhere to RFC 2616. Well, MSIE does not. To quote the RFC:

7.2.1 Type
[snip]
    Any HTTP/1.1 message containing an entity-body SHOULD include a Content-Type header field defining the media type of that body. If and only if the media type is not given by a Content-Type field, the recipient MAY attempt to guess the media type via inspection of its content and/or the name extension(s) of the URI used to identify the resource. [snipped]

Thus, a browser MUST adhere the Content-Type if it's given.
OK, now load IE and try to visit this site, or this site (warning: browser will crash). Note that the content type of these sites is text/plain and thus the text should simply be displayed on screen.

Therefore, IE is not a "web browser".