Beware of Greeks bearing gifts, the ides of March, and e-mail attachments from unfamiliar sources. It's a good idea to delete any message you receive with an attachment from an unfamiliar source before you even open the message. Attachments may hide a virus that could infect your computer. Unfortunately, Outlook doesn't have any built-in virus protection; however, if you work in an office environment, chances are your system administrator has done his or her darnedest to keep the system safe by installing some antivirus software. If you are concerned about viruses on your home computer (and you should be), purchase, install, and regularly update separate virus protection software. Two good online sources for antivirus programs are McAfee's VirusScan or Symantec's Norton AntiVirus.