I'll mark this for the PM to review.
Also, I noticed you were on APM 3.1--do you know the current release is 3.5? You can upgrade for free via your customer portal if you are on active maintenance.
Here are the 3.5 release notes. It contains a the following fix re: MAPI, in case this helps you:
Fixed memory leaks in MAPI User Experience and Windows Script component monitors.
Thanks for the feedback, Scott... I've logged these as feature requests.