Because it might break your computer! (Score 1)

One day I went to pull up the my-yahoo home page co-branded by my dsl carrier using Opera for Sharp Zaurus. To my surprise I got a page telling me that I needed to upgrade my browser to netscape 6 or ie to view this page. This was new! Figuring there was some sort of misunderstanding I dug out the support number for my beloved dsl carrier and asked them what the problem was. The best explanation I could get out of the over-seas support people was that their website could cause damage to my computer if I didn't use the correct web browser to view their content!