Managing Hangouts for Google Apps
Google Hangouts unifies chats, audio calls, and video meetings across all of your users' devices. Whether they're in Gmail, on the desktop, or on Android or iOS devices, your users won't miss a thing because all their Hangouts are synchronized.
As a Google Apps administrator:
Although Google Hangouts for Google Apps is enabled by default, you may need to turn on video calls if previously disabled by an administrator, turn on Hangouts Chat (if your organizations uses Google Talk), install the Hangouts apps on user devices, or change other settings that optimize the Hangouts experience.
Customize Hangouts video calls to simplify guest access, join from non-Google video call systems, use Hangouts video calls with Microsoft Outlook, or get additional features using Google+.
Install the Hangouts Plugin for Microsoft Outlook to allow users to schedule Hangouts video calls with other Outlook users in your organization.
Questions about using Hangouts with Google Apps? See the Hangouts FAQ for administrators.