Fax from outlook without a contact record

Hi,
Is there a way to type in a fax number directly into the address section of
an email (ie not having to create a business fax record in outlook
contacts).
I seem to recall in earlier versions you could type:
fax:888-8888-8888
and it would send that fax (which was great for mail merge) but it doesn't
seem to work with windows xp and office/outlook 2007- unless i am missing
something - which does happen sometimes.

Thanks heaps