Thank you for clarifying.
As I understand it, the Exchange team had split their mailbox usage among Exchange 2010, Exchange 2013, and Office 365 back end services. All of those services have the latest updates applied before releasing them to the public and a number of Exchange coders are utilizing the latest product patches themselves currently.
Perfect. Not sure what the others are complaining about here with that enlightenment. Sounds like everything is working correctly in development and the patches are in fact being tested with live Microsoft users. Sounds like you are on the right track and I look forward to applying this update for my customers.
:)