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Just so, what does a shared mailbox mean?

A shared mailbox is an inbox that allows multiple people to send and receive email from the same address. Because a shared mailbox is an entire inbox, the members have a common calendar, and contacts list.

Secondly, does a shared mailbox need a user account? Each shared mailbox can be a maximum size of 50GB but shared mailboxes over 50GB in size need to be licensed. A Shared mailbox doesn't have a username and password and users cannot log into it directly. A user must sign in to his/her own mailbox and then open the shared mailbox using permissions.

Beside above, when should you use a shared mailbox?

Cases where you might want to use a shared mailbox The shared mailbox provides a better solution than just forwarding because it provides access to the entire mailbox. We use this for transitional purposes so the new person in that role or manager can move the contacts, calendar, and other information in that mailbox.

How do I access a shared mailbox?

Use a shared mailbox on a mobile device (phone or tablet)

1. Sign in to your primary account in Outlook for iOS or Android.
2. Tap the Add Account button in the left navigation pane, then tap Add a Shared Mailbox.