It has a "send internet fax" function
I assume that's what we're talking about here. So does Outlook Express IIRC.
( the mighty badger Aphrodite, on a bar stool, by your side, Wed 27 May 2009, 15:48, archived)

But "To Use Fax Service to send your fax, you must first sign up with a fax service provider."
And it redirects you to a list of providers (including eFax).

Which I guess is what Roopy was asking about.

And I was very nicely, and not in a trolling way, answering.
( The Teviot Moose major 5th., Wed 27 May 2009, 15:51, archived)