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In this post I will explain how to create a shared mailbox in Exchange Online. This can be used if you want to use a shared mailbox to send invitations, book resources and handle replies using one of the following add-ins.
To do this you first need to login to your administrator account on Office 365.
Then expand the Admin centers menu on the left and select Exchange.
This takes you to the Exchange admin center dashboard. Then you should click on Recipients.
Select Shared from the options at the top of the screen.
Then click on the plus icon to add a new shared mailbox.
Fill out the information in the form and click on Save.
You also have to add yourself to the Users that have permissions to view and send mail from this shared Mailbox.