I received an email purportedly from Microsoft on Friday. It was suspicous because the email address was wrong. When I examined it under Yahoo I found the attachment contained an executable file. I let Yahoo scan if for a virus and it told me it was a worm so I deleted it. Today I found out it is called swen. For more info read this article at SearchSecurity.com, http://searchsecurity.techtarget.com/originalContent/0,289142,sid14_gci928518,00.html.