You've got an unhealthy Outlook...

...if you're running Outlook Express 4 or 5, Outlook 98 or Outlook 2000. All of these are vulnerable to a new exploit detailed in this article. The exploit takes advantage of Outlook not bothering to check an attached file to see if it's the same filetype that its extension claims it is. Certain files (like .jpg's for example) get automatically opened without your permission when you view a message. If it's really a picture, no problem. If, however, it's a .cab file containing a malicious program, that program (with the aid of a Javascript program in the e-mail) will automatically get decompressed and executed, without Outlook prompting the user first. Bad things.
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