In order to publish your calendar to the Internet using Outlook 2016/2019 you may follow these steps: Note: Calendar publishing is not available in Outlook for Mac.

How Do I Share (Let Others See) My Outlook Folders (Inbox, Contacts, Calendar etc.)? If you want to share a calendar with internal uses, please follow the isntructions in this Kowledge Base Article: The functionality is available for Exchange 2013/2016/2019 accounts.Publishing Public Folder calendar is not supported.Publishing calendar with Editor permission level is restricted due to the nature of the shared hosted environment.Contact Support to enable other options ( Limited Details or Full Details) if necessary. By default, you can only choose Availability Only for publishing.To make a calendar available to people outside the organization, you can use the Publish a calendar feature. External users can view and subscribe to the calendar, however they are not able to edit it. Calendar sharing is only available for people within your organization.