

To create a new Shared Mailbox click the + Icon, enter a Mailbox name and an Email Address:
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To create a Shared Mailbox (in Office 365 Small Business) login to the Microsoft Online Portal, click on Users & Groups and in the Users & Groups window select the Shared Mailboxes tab. You can check this on the Exchange Online Limits page on Technet. There used to be a 10 GB size limit on Shared and Resource Mailboxes, but this was changed recently (November 2014) and all Shared and Resource mailboxes are now restricted to 50GB, just as regular Mailboxes.

The interesting part is that you don’t need a license to implement a Shared Mailbox (or a Resource Mailbox for that matter) but the users that access the Shared Mailbox need to be licensed though. The latter are user independent Mailboxes and have common email addresses, for example or These Mailboxes don’t have a specific user account but are mostly shared between a number of users. In Exchange 2013 there are regular Mailboxes and there are Shared Mailboxes.
