I've had Unity upgraded 3 times over the years and wanted to know if the legacy Example Administrator and Example Subscriber accounts were still necessary. Thought I heard/read they were not, but cannot find supporting documentation. Unity 5.0(1).
I believe with new installs the Example Subscriber is no longer created. We've deleted our example subs to save a user license. Please read this link regarding the Example Admin account in the section titled "About Default Accounts" - http://www.cisco.com/en/US/docs/voice_ip_comm/unity/5x/administration/guide/ex/5xcusag080e.html