Outlook lets you share your calendar with other people so they can more easily schedule meetings and appointments with you. Alternatively, you can create new calendars (for example, for specific projects or groups of people), and share them with anyone you choose.
You control what recipients see - whether it's just "busy/free" labels, specific categories, or full details. You can even grant people permission to create and modify events on a given calendar, if you choose.
Sharing is as easy as right-clicking on the calendar you want to share in Outlook on the web and selecting Sharing Permissions. This will allow you to edit the permissions of the calendar, as well as send invites to new people you want to add.
To learn more, check out Microsoft's detailed support page for Calendar sharing.
If you have any questions or need assistance, please contact the IT Service Desk at 508-565-4357 or via e-mail at firstname.lastname@example.org