Course summary: Create a shared mailbox in Office 365
Add a shared mailbox to Outlook Web App
Sign in to Office 365 with your work or school account.
At the top of the page, select Outlook. Or, select the app launcher , and then select Outlook.
Right-click (or press and hold) your name in the folder list and select Add shared folder.
Type the name of the shared mailbox and then select Add.
Add a shared mailbox to Outlook
In Outlook 2013 :
If you are a member of a shared mailbox, the mailbox automatically appears in your Outlook folder list.
In Outlook 2010 :
Select the File tab. Then, select Account Settingsand Account Settings.
Select your Office 365 Exchange account, and then select Change. Select More Settings, select the Advanced tab, and then select Add.
Type the name of the shared mailbox and select OK.