This article deals with the subject of forensic investigation of Instant Messenger histories: why it is needed, what messenger types are, what difficulties are involved in investigating histories and what tools can help overcome those difficulties.

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In our days Instant Messengers cannot surprise anyone. They are widely used by people with access to the Internet, by people of any age, gender and professional occupation. You can exchange jokes with your friends via your IM, discuss business questions with your colleagues, support your customers, make an appointment with your girlfriend, and even to propose marriage through your favorite messenger. A huge question arises immediately - what's about security? Are you and your recipient only ones who can see your conversation? Can anybody else access your history which is probably confidential, especially dealing business and personal questions? Can any malicious user or your boss or your parent learn your secrets?

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