Several e-mail hoax sites claim that both the #90 thing and the XALAN virus are hoaxes and can be ignored.   :smoke:
I have generally found that 99.9% of "warning" e-mails are complete and total hoaxes, probably started by people with nothing better to do with their lives.  :angry:  The first thing I do is Google the operative words plus "hoax" and see what comes up.  You'll almost always get a number of hits at some of the anti-hoax sites out there.  
So, while I would still be more than a little wary of someone calling my cell phone out of the blue and asking me to hit any particular set of buttons, I don't think we have to worry about this one.