Firstly, we do run a service which provides free web-based e-mail accounts - see
here. So it is just
possible that the spam you received was actually sent by the owner of
that account. But it is much more likely that the address was "spoofed"
(i.e. forged).
Most spam sent at the moment is sent with forged e-mail headers. This
means that the e-mail appears to come from an address which it didn't
come from.
The spammer has "harvested" this e-mail address from the web of as a
result of viruses taking over people's PCs and picking up e-mail
addresses from address books.
So we have no control over the person who is sending this spam.
Microsoft has proposed a change to name servers which may prevent or
reduce this sort of thing at some time in the future. In the mean time,
please have a look at our
short article
which shows you ways you can block spam when it arrives at your PC.