Anyone who is not a slave to Microsoft, need not be concerned with this virus:

from http://vil.nai.com/vil/content/v_99367.htm

This worm makes use of Incorrect "MIME Header Can Cause IE to Execute E-mail 
Attachment" vulnerability in Microsoft Internet Explorer (ver 5.01 or 5.5 
without SP2)

This worm arrives in an Email message with a subject and body randomly 
composed from a rather long pool of strings that the virus carries inside 
itself (the virus can also add other strings):

On Monday 13 May 2002 02:14 am, Bill Cavalieri wrote:
> I installed Kaspersky anti-virus for sendmail last week, and have been
> getting  on avg 4 messages a day stopped at server,  that had the klez
> virus attached.  Didn't realize it was that bad.  If you all don't have
> anti-virus software installed, I would recomend finding some.