you have found the right tool. buy the entire power tools utility as well to handle your orphan mail files. ask them if they can bundle the 2 products together for you. I've been using power tools for years and it has a lot of cool stuff in it. I believe the unused groups tool requires you to enable message tracking but check with helpsoft support on that.
Feedback response number WEBB8UTQ8T created by Paul K Smerdon on 05/31/2012
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. . power tools (Paul K Smerdon 31.May.12) 
