Pardon me if this is not appropriate for this forum; I'm new. This is another virus that uses the Outlook address book as a source of addresses to spread itself. Here's the link from McAfee:

<A target="_blank" HREF=http://vil.nai.com/vil/virusChar.asp?virus_k=99035>http://vil.nai.com/vil/virusChar.asp?virus_k=99035</A>

It is very destructive and it seems to use the whole address book rather than just the first 25 or 50 entries. At least that has been my experience at work today.