Joshua C. answered 08/12/19
Heavy user of Outlook for 12 years
Outlook is a Microsoft Product. To activate any Office 2007, 2010, 2013, 2016, 365 product you require a paid license for activation. Recently, a Microsoft Account is tied with the purchase of a subscription either through your company or directly to your personal account with Microsoft to verify ownership and licensing of the product.
There are different subscription plans at different cost points such as $10 or $6 a month.