Activation still requires human intervention, generally in the form of opening an attached file.
It can, of course, also be spread by copying an infected file from one system to another. CERT provides a pointer to a Microsoft information site . It also provides pointers to various other antivirus sites. Please have a look at these to see the latest news and to be sure you have the most current virus definition files. Any mail handling system could experience performance problems or a denial of service as a result of the propagation of this macro virus.