What is a Trojan horse?
Trojan horses are impostorsfiles that claim to be something desirable but, in fact, are malicious. A very important distinction between Trojan horse programs and true viruses is that they do not replicate themselves. Trojan horses contain malicious code that when triggered cause loss, or even theft, of data. For a Trojan horse to spread, you must invite these programs onto your computers; for example, by opening an email attachment or downloading and running a file from the Internet.
read it. twice. it says i could have had data stolen. plus i did open an email, there wasn't an attachment, but still i opened an email.