"Many of the most common computer viruses and other malicious software are spread through e-mail attachments. If a file attached to an e-mail message contains a virus, it's often launched when you open the file attachment. No matter what e-mail program you use or what version of Windows you're running, you can help avoid some viruses by following a few basic rules. If you use the latest version of Outlook or Outlook Express and if you use the latest version of Windows, there are a few unique enhancements and default settings to help keep you from accidentally infecting your computer with a virus.
5 tips for dealing with e-mail attachments
Dealing with e-mail attachments in Microsoft Outlook
Dealing with e-mail attachments in Outlook Express"