How to manage Enterprise Distribution certificate expiration?

Question

Our customer has just joined the iOS Developer Enterprise Program. They have signed the app (developed by us) with their Enterprise Distribution and installed it succesfully

Answer 1

Note: The hierarchical text below indicates the path to the information that explains the solution. You must navigate to (expand the arrows next to) the items in the sidebar to see the solution (Mani, please don't delete this info - it's there to direct the viewer to the solution.)

Current documentation from Apple:

Distributing Enterprise Apps for iOS Devices
    In-house apps
      Certificate validation
      Providing updated apps

http://developer.apple.com/library/ios/#featuredarticles/FA_Wireless_Enterprise_App_Distribution/Introduction/Introduction.html

From Providing updated apps:

You can have two distribution certificates active at the same time; each is independent from the other. The second certificate is intended to provide an overlapping period during which you can update your apps before the first certificate expires. When requesting your second distribution certificate from the iOS Dev Center, be sure you don’t revoke your first certificate.

That there is not a seamless way to do this so that all our internal customers don't need to see this is rather terrible lack of functionality.