I get around 50 of them a day lately... Started a week ago.
w32/swen it is supposed to be called... based on the sobig virus or something.. You also usually get other mails at the same time, with the topic: delivery failure, message from admin and so on.. This last email executes the attachments of automaticly just by reading the mail, if you dont have the latest patch for win2k or xp installed.... as we all know, outlook automaticly opens the last mail when you start it up, so you get infected by doing nothing... pretty unsecure if you ask me..