Access the shared mailbox: You should see the username listed below Folders now, you may have to expand the list to see the Inbox and this new mailboxes other folders.
Once it’s selected just click the Add button You’ll be prompted to enter the shared folder name, enter the name or email address of the mailbox, it should appear in a drop-down, then you can click on it from that list.
Add a shared folder: On the left hand side of the page where it lists your Inbox and other folders for your email, right-click on Folders, then click Add shared folder.
If you regularly access this other mailbox using Outlook on the Web then this method will simplify your access so you can view all mailbox content in one place instead of having to open separate a separate mailbox. We recommend clicking search even though your result may show up in the search, this ensures that you are not trying to open your contact but the actual mailbox Once you have entered the name click “Search Directory”.
Search and Open the mailbox: Type the name for your mailbox that you are going to open (this will be told to you or you will know the name of the mailbox) such as “support” or “sales” etc.
Open Another Mailbox: Once logged in, head over to the top right hand corner of your browser and click on your account initials (or your account profile picture if you’re using one) and then click Open another mailbox.
If you login through that is ok as well, its just one more step to get you sorted out
Log in to Outlook: Logging in with Office 365 using your browser is easy, just head to and login.
If you regularly access this other mailbox then please refer to the steps found below under Regular Access Type the shared mailbox address into the 'E-mail Address' field and leave all the other fields blank, then click 'Next'. Select 'Email Account' and then click 'Next'. Click on 'New' to create a new email account.
Use this method to quickly access another mailbox in Outlook on the Web. Account Settings > Account Settings (see image below) 2.