Keep in mind that the patent is meaningless until Microsoft tries to enforce it. Microsoft's attorneys clearly scored a winner by getting this through the patent office, but that doesn't mean much.
When and if Microsoft tried to enforce this thing, it will be quickly ruled invalid by prior art. Consider: Microsoft's filing date is December 6, 1996. According to a Yahoo
press release, they had my.yahoo.com running on July 15, 1996. If I could find that in five minutes, imagine what you could dig up with a little extra work.