Well, in my opinion never...a virus is a virus is a virus. However...

The FriendGreetings electronic greeting card has all the hallmarks of a mass-mailing computer virus.

The e-mail misleads a victim into downloading an application--ostensibly to view a Web card--then sends itself to every e-mail address in the victim's Outlook contacts file. At least a few systems administrators have complained in Usenet postings that the mass-mailing e-card was to blame for swamping their network.

Yet the creators--Permissioned Media, a company apparently based in Panama--will be hard to prosecute: The viral card is protected by a license agreement that tricks unsuspecting users into clicking "Yes" and consenting to have the program send itself to all their e-mail contacts.
You can read the entire article here.

As far as I'm concerned, the fact that it uses what I already consider to be a nefarious device, the "EULA", to make its payload "legal" just makes it that much more despicable. Just another example of why you *HAVE* to read the fine print on everything these days. Be careful when you click!!!