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Three users have been created with full access to Exchange, SharePoint and Lync, therefore three licenses have been used up. Licenses are scalable, so one can add more licenses as and when they are necessary.
During the trial, it is not possible to upgrade to a bigger and better subscription. However, once Office 365 reaches general availability, the administrator will be able to purchase more subscriptions as the company grows.
The service health page exists to display if and when there has been any downtime of any of the Office 365 services; to make Microsoft accountable for your business productivity. It displays up until the end of the past week.