E-mail received - supposedly from Microsoft

From: Eric Einbinder (eeinbin1_at_nycap.rr.com)
Date: 09/19/03 

Date: Fri, 19 Sep 2003 04:25:02 -0700

I received an e-mail asking me to use the latest Microsft
security patch, and while the name of the sender
was "Microsoft Customer Support", the e-mail address
seemed suspicious. The file didn't appear to have been
created by Microsoft, as my computer gave me a warning
that the publisher cannot be verified (usually Microsoft
digitally signs their files for safety).

Is this a virus or hoax, or is it real?

Eric