I hope this is the right forum to post this question. Please forgive me if it is not. We have recently installed the coexistence software to blend our 2014 GW and 2013 exchange systems. We have been running the combined address portion for several weeks with all issues resolved. We installed the free/busy application, which reports no errors during the install, and everything initially looked good. But when we checked the OWA access, users could not log in. Upon investigation, it appears the OWA service shuts down. As soon as the FB app is uninstalled, the service restarts and OWA users can log in. Reinstall the app, OWA shuts down. We have tried restarting IIS, but that does not fix the issue.

Anyone got some direction as to what we might try next?

Thanks for your input.