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If I have 10 different email users in my organization. Do I have to buy office 365 license for each of them?
I am assuming that you are on P plan, you have to purchase license for each user in your organization so they have access to the service. Please see here for the pricing and the service available www.microsoft.com/.../all-plans.aspx
How are things going on your side? If you need further assistance, please let me know. Thanks.