Note: In order to open a shared Mailbox, you will need to have given access permission to that mailbox. 

1. Go to outlook.office365.com and log in with your @ef.com username.

2.   Find your Display name in the top right hand corner click on it, then choose ‘Open another mailbox…’

3. Type in the email address of the mailbox you have permission for, then click Open. This will then open up your shared mailbox online.

If you need to setup an Out of Office on a Shared mailbox, please use the guide in the link below:

Setting an Out of Office Notification in O365