2.Select Other from the list of types.
3.Tap Add Mail Account.
4.Enter a name for the mail account (e.g. Shared Mailbox)
5.Enter the email address of the shared mailbox
6.Enter the password of a mailbox that has access to the shared mailbox (e.g. your own password)
7.Enter a description for the mailbox (e.g. Shared Mailbox)
8.Tap Next.
9.Select IMAP
10.Fill in the following:
Under Incoming Mail Server
Host Name: outlook.office365.com
User Name: enter the email address of the account that has access to the shared mailbox, followed by a "\" and then the email address of the shared mailbox itself (e.g. yourmailbox@domain.com\sharedmailbox@domain.com)
Password: Enter the password of the mailbox with the permission to access the shared mailbox (your password)
Under Outgoing Mail Server
Host Name: smtp.office365.com
User name: Enter the email address of the mailbox with the
permission to the shared mailbox (e.g. your yourmailbox@domain.com)
Password: Enter the password of the mailbox with the permission to
access the shared mailbox
11.Tap Next, then tap OK for the error. Tap Next again and then Save.
12.Click on the Account you just created.
13.Click under IMAP the account you created
14.Click Advanced at the bottom
15.Click Use SSL to enable with a Green slide
16.Click on Account to go back
17.Click Done, you should see check boxes showing you are now able to login to the account
18.In the next screen, choose which items to sync and tap Save.
19.Exit Settings and start the Mail app.