Open Another Mailbox
Click on the Profile Picture or User Icon in the top right corner of the Browser window. Select “Open Another Mailbox…“.
Enter E-mail Address
Enter the Full E-mail of the Shared Mailbox that you wish to open and select it from the list. Click “Open”.
Your Shared Mailbox will open in a new window. From this window, you can send and receive mail as that mailbox as you would your own.
Bookmark this page and open directly into your shared mailbox whenever you are logged into Office 365 with your Work or School Account!
For Outlook 2016
Launch Outlook 2016 for Windows. Open a New Mail as if you were going to compile a mail to send.
Open the Options Tab in the top bar of the New Message window. Click the option “From“.
Note: May hide From field in step 3 if already selected.
On top of your “To..” and “CC..”, click “From” and select “Other Email Address“
Enter full E-mail Address of your Shared Mailbox and click OK.
Note: If you are not assigned rights to the Shared Mailbox you will not be able to do the above.