How do I add a shared mailbox in Office 365?

Sign in with your Office 365 admin account at https://portal.office.com/adminportal/home.
  1. In the Admin center, go to Groups > Shared Mailboxes.
  2. On the Add a mailbox page, enter a name for the shared mailbox. …
  3. Click Add. …
  4. Under Next steps, choose Add members to this mailbox. …
  5. Choose the +Add members button. …
  6. Choose Close.

How do I access a shared mailbox in Outlook 365?

Open the shared mailbox in a separate browser window
  1. Sign in to your account in Outlook on the web.
  2. On the Outlook on the web navigation bar, click your name. A list appears.
  3. Click Open another mailbox.
  4. Type the email address of the other mailbox that you want to open, and then click Open.

How do I add a shared folder in Outlook 365?

Accessing another person’s folder(s) using OWA
  1. Login to OWA.
  2. Click Mail to open your mail folders.
  3. Right click on your name in the folder list.
  4. Choose Add Shared Folder.
  5. Type the name of the person whose folder you wish to open and click Add.
  6. The folder will appear at the bottom of your folder list.