One of the features of the Klez virus is to grab two e-mail addresses from
the infected computer's outlook address book and use them as the from and
to addresses. So, the infected computer had to have william@userfriendly
and your customer's e-mail address stored in the address book.
Have you checked all of your systems?
This archive was generated by hypermail 2.1.3 : Tue Oct 19 2004 - 23:37:15 EDT