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In the Office 365 admin center, go to Groups > .
Sign in with an Office 365 global admin account or Exchange admin account. If you get the message "You don't have permission to access this page or perform this action" then you aren't an Office 365 admin. Find the admin in your business.
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On the Add a mailbox page, enter a name for the shared mailbox. Then the wizard chooses the email address, but you can edit it.
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Click Add. It may take a few minutes before you can add members.
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Under Next steps, choose Add members to this mailbox. Members are the people who will be able to view the incoming mail to this shared mailbox, and the outgoing replies.
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Choose the +Add members button. Put a check mark next to the people who you want to use this shared mailbox, and click Save.
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Choose Close.
You're done! You have a shared mailbox and it includes a shared calendar.