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Microsoft's MSN Hotmail will update its virus scanner to protect users against the "picture.exe" Trojan horse, which comes in an email attachment, swiping browsing histories and AOL user names and passwords. A Trojan horse is a program that works in a way that the user does not expect. It differs from a virus in that it does not replicate itself. Hotmail since December has offered users McAfee's virus-scanning software for incoming attachments.