Completed apps should never just be pushed onto employees. There should be a buildup of excitement, and catered rollout events to train employees in the use of the app. Well-recieved apps are not seen as just another layer of technology. That's app integration.
App Integration takes on many forms. Catered rollouts, training materials, web pages, landing pages, animated explainer videos...all of designed to guarantee acceptance of your app for your audience. Without this service, your app's purpose will fail, and your investment will be lost.