Create Shared Calendar In Microsoft 365 Admin Center. To create a shared calendar in office 365 you need to create a shared mailbox and assign full access permissions to users who will use its calendar. We like the shared mailbox calendar rather than a sharepoint.

In my opinion, you can create a specific office 365 account and then share this account’s calendar to everyone with the custom permission. A team site calendar helps keep your team in sync by sharing everyone’s meetings, project milestones, and vacation time.