I'm getting the same thing, which isn't surprising since I'm using Opera. In general, I think it's fine to say "browser not supported" if that's the case, but

I'm getting the same thing, which isn't surprising since I'm using Opera. In general, I think it's fine to say "browser not supported" if that's the case, but it's nice to have a "Try anyway" link. There are too many sites that work fine with a given browser but refuse the user a chance to try. If you give the user a choice, the worst case is that the site really is broken with their browser, and they say "Hmpf, guess they're right" and move on. I suppose there's a potentially worse case where the site is broken in some subtle way that causes data corruption or the like, but I can't imagine there are many webapps where this is a serious concern.