Use Email License For Free

Outlook and Gmail are both free for personal use. If you want to unlock additional features or get more storage space, you need to purchase a premium plan. The most affordable Outlook premium plan for home users is called Microsoft 365 Personal, and it costs $69.99 a year, or $6.99 per month.

In the admin center, go to the Users > Active users page. Select the row of the user that you want to assign a license to. In the right pane, select Licenses and Apps. Expand the Licenses section, select the boxes for the licenses that you want to assign, then select Save changes.

For an unlicensed user, user's mailbox is shared mailbox, then other user who has delegation permission can access Shared mailbox but if normal user without license. They can't login OWA, also they will not be able to use any of the Microsoft 365 applications such as Outlook, Word, Excel, etc. without a license.

Microsoft Outlook is an email client (?client? meaning service or tool) that provides email services to both businesses and individuals. While Outlook for individuals is a free service, those looking to use Outlook for business will have to pay for additional features and functionality.

To access a shared mailbox, a user must have an Exchange Online license, but the shared mailbox doesn't require a separate license.

With a single license, users can and activate Microsoft 365 Apps on up to 5 desktops/laptops, 5 tablets, and 5 mobile devices. Subscription User Based Licensing requires user level activation and requires user sign-in with an Azure Active Directory account.

Outlook retail licenses These licenses are available through retail purchase. Though retail license versions of Outlook do not include Exchange Server or Exchange Online, some can connect to Exchange to enable certain features.

Microsoft License Terms: Outlook requires an eligible Office 365 commercial subscription for commercial use rights ? an Office 365 plan that includes the Microsoft Office suite? Non-commercial use of Outlook is free (Outlook.com, Gmail.com, Hotmail.com,etc).