I too suspect Hotmail as a spam source. Two of my kids recently opened Hotmail accounts and now all of a sudden my main email address is getting regular spam/virus emails ie All starting with RE: and Hi: etc
Can the registration process for Hotmail have a hidden agenda?
I have used Adaware/Spybot/CWSShredder/Spywareblaster and Spider. But no avail.
If the Hotmail accounts are not accessed for a few days, the spam to my main account reduces. There does seem to be a tie in somewhere.