This sounds like a really interesting product, inbox analytics for Outlook.
Xobni Products — addins for Outlook:
How do you use email?
* How much time do you spend reading and writing emails?
* How quickly do you respond to emails?
* What time of the day is best for contacting busy people?
* What time of the day do you receive your most important email?
* How much time do you spend reading mailing lists?
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