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If the hacker is hijacking email from a Microsoft Outlook 2003 or Outlook 2002 client, it may be possible to determine a computer's IP address by using read receipts. The catch is that the Outlook email would have to have a read receipt, and the originator of the message would be the one that could tell you the source IP address listed in the header of the read receipt.
If the person reading your email is doing so with Outlook Web Access (OWA), then it is much harder to track. All communications can be tracked, but you will need to capture the traffic with a network monitoring tool (e.g., NetMon, Wireshark, etc.) during the time frame that the incident occurs. Reviewing the capture log could reveal the source IP address of your hacker.
The IP address is really only of value to you if it is coming from within your organization. If the connection is being established externally, then you will not be able to rely on the IP address in the capture as it will probably be coming from the external interface of a firewall that is performing network address translation (NAT).
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