In the mid 90's, before Linux had gained any traction in corporate environments, IE was available for some flavours of Unix such as Solaris and HP-UX. In the Solaris shop I was working at the time, I remember we had a great laughs at the slogan they were using: "Bringing the internet to Unix". I don't believe it was particularly popular and it dissapeared quietly a few years later:
http://en.wikipedia.org/wiki/Internet_Explorer_for_UNIX