You can create as many users as you want. You pay per activated user per month.
Example: You have 3 active users at the start of the month, during the month you activate 1 additional user.
On your next invoice, you will be billed for a full month for the three active users. For the new user you will be billed for the number days it has been active.
Note: This product will be discontinued and only available to existing customers. It’s replaced by the new Microsoft plans, which include Exchange Mail and Office 365 products.
Related articles: