Shared Mailboxes - Best way to use on mobiles/tablets

IIRC you can add it in the iPhone mail app.

I don't have an iPhone in front of me, but I think these are the steps:

Go to Settings. Click on Mail, contacts & calendars. Click on Add account.

Choose "other" as the type of the account.

On the next page you'll:
Enter Name.
Enter the email address of the shared inbox. (i.e. sharedmailbox@yourcompany.net or something)
Enter the your personal password.
Enter a description.

When you're done you click next. On the following page you select IMAP.

Incoming mail server:
Host name: outlook.office365.com
Username: Your personal email, followed by "/nameofthesharedmailboxaccount" For example: markus.turba@yourcompany.net/sharedmailbox
Password: Your personal email password.

Outgoing mail server:

Host name: smtp.outlook365.com

User name: Your personal email address.

Password: Your personal email password.

I'm not 100% sure about this as I don't have an iphone available to try this on. But I hope it helps. :)

/Elias