Great news for those that have been lucky enough to attend past MEC conferences and miss attending them...MEC is back and in Orlando! Microsoft has created a website at http://www.MECisback.com where you can leave your email address to gain additional information.
For those that have never attended MEC, it is the premier conference dedicated to Microsoft Exchange, partners, and all involved. I would assume there will be a bunch of Unified Communications as well but that is to be seen.