Thanks for posting Donna,
Not being a ambulance chaser here, as this is a nasty email doing the rounds. Very similar to the Encrypto Virus of late last year.
It WILL over write any drives connected to your PC.
It WILL over write any drives connected to your network that you have access to.
Just don't click in the body of the email if you receive it and delete it and your safe, click on any internal link you are screwed.
(I have a nights work restoring my works network from backed up drives thanks to a unwary user, His PC is DEAD and not coming back)
Also a good reminder if you do backup regularly as you should and DO NOT LEAVE that backup connected to your PC, as it will be overwritten from this unrecoverable encryption as well.
JD