They both infect MS Word documents and can exist in Mac or PC files. Please check your Word documents for these viruses. These infect diskette boot sectors. It has a virus that rewrites your hard drive, obliterating anything on it. Please read and understand what I will explain below before you forward or act upon ANY such message that you might receive.
Computer viruses can circulate via e-mail but only in attachments.
That is, if someone sends you a word processing document, program, or other type of file attached to an e-mail message, it could contain a virus, just as a file you get on a diskette could contain a virus. You will not get the virus by reading the e-mail message. This is always good practice. The same advice holds if you download a file from the internet or get one on a diskette or from a dial-in source. Note that the messages you get from off-campus should all have an attachment called Headers.822 attached to it.