Jason Mayans is the PM lead for many of the more end-user-oriented features in Exchange 12 such as improved calendaring and search.
He's kicked off his new blog with some cool historical posts on how we designed Smart Scheduling in Outlook/Exchange, including some screenshots of the designs over time which is always interesting to see:
The Evolution of “Smart Scheduling” in Outlook 2007 – Part 1
The Evolution of “Smart Scheduling” in Outlook 2007 – Part 2
I already threatened him with bodily harm if he starts a blog and then doesn't post to it regularly, we shall see if my threats have the desired effect. :-)