Bring back MEC!
There are fewer and fewer 400 level Exchange topics each year. I don't think there was a single one last year. At least this year it looks like you killed off the developer sessions for Exchange, but there look to be a number of them under other topics. Doesn't the PDC cover sessions for developers? I understand the need for Microsoft to have a very strong developer network, but the infrastructure/architecture needs to be strong and flexable in order for them to develop on.
This year will possibly be the last year I will attend if this trend continues. I know several people that have already said they won't attend because of it.