Use caution when opening email attachments
Email attachments are a common tool for attackers because forwarding email is so simple. Users often open attachments that appear to come from someone they know or an organization they do business with. Almost any type of file can be attached to an email message, so attackers have more freedom with the types of viruses they can send.
If your email program includes an option to automatically download email attachments, DON'T take it. Doing so could immediately expose your computer to any viruses included in the email attachments.