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From here, it is possible to edit whether users can send file transfers, enable audio and video functionality within Lync, and enable external communications such as landlines.
This page allows you to create new users to your organisation. At this stage, only 25 licenses are available to use, but there is no restriction on how many users there can be within the organisation. However, it does mean that users access to certain features like SharePoint and Lync are rationed.
To create a new user, as you would in any other application or cloud service, you can either import them from an Active Directory or similar, or create them manually.