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This is a "worm" type of infection, and NIS seems to have successfully blocked any virally corrupted attachments or malicious content in the email at the point of entry on your PC.
I wouldn't worry about this any more if were you, bad luck for your friend tho, seems like he was hit with the virus.
Edit: You should delete this email immediately.
Deleting the mail is the best you can do
Thanks for your comments. My search online resulted in a forum from C-Net back in Dec 07. From this it would appear that may be affecting web mail systems like Hotmail and Yahoo as those affected seem to be using those but not finding any trojan or virus on actual PC or effects in Outlook or Outlook Express. One suggestion was that it was a password cracker accessing online mail accounts, sending out mails and then changing the password so owner can’t get back in. Have changed my password on my email account to a stronger one just incase.