I am not aware of any free third-party controls that you could use. However, this sounds like it could be a VSTO project that integrates into MS Outlook 2007 (or 2003 if you haven't upgraded yet). Then you have the full capabilities of Outlook while still allowing your own custom logic and information. Unfortunately I can only suggest this, I have not worked with VSTO so I would be unable to suggest anything more. Hopefully this leads you in the right direction though.
Regards, Thomas Stockwell Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning. Visit my Blog