The emailadress of such a bot could be changed like thousand times a day if they want. Besides that there have been probally more then 100 of simulair stories close to this one, most of them turned out to be false in the end.
If you are using the latest version of Messenger (6.2) or even the latest 7 beta, then you have only very low risks of getting infected without a virus without knowing it. Almost every virus that spreads trough Messenger works by sending a file. You will need to accept this file and run it before you can get infected with anything.
To secure yourself from viruses, don't memorize emailadresses of possible dangerous virus bots, but:
- Always be carefull when accepting a file from people, certainly from people you don't know.
- Have a good virusscanner installed and make sure it stays up to date and running.
- Keep windows up to date, turn on automtic updates or visit www.windowsupdate.com manually and update on a regular basis.