Two sentences in, there are three cryptic acronyms - MDM, BES and BYOD. Apparently the "customers" that the letter was written for are not Blackberry's end users.
For the record:
MDM - Mobile Device Management - a thing to integrate management of a companies cell phones
BES - BlackBerry Enterprise Server - the MDM made by BlackBerry
BYOD - Bring Your Own Device - The practice of employees using personal cell phones for company business. The company deploys some set of apps and services onto the device which allows them some measure of control over it, and the employee gets to use a mobile device that they are comfortable with.
https://en.wikipedia.org/wiki/Enterprise_Mobility_Management
Googling reveals Enterprise Mobility Management.
From Wikipedia: "Enterprise mobility management (EMM) is the set of people, processes and technology focused on managing the increasing array of mobile devices, wireless networks, and related services to enable broad use of mobile computing in a business context."
Yikes.
If you ignore 90% of the words in that sentence, it becomes much more understandable.
To our valued *enterprise* customersYou've got that flipped around.
BYOD - Bring Your Own Device
BES - BlackBerry Enterprise... Something?
Big companies are just that way.