Access my shared mailbox with Outlook on the web

Use Outlook on the web to access a shared mailbox or another user's email you've been given access to. You can choose to open the mailbox in a new window or add it to your folders list.

1. Sign in to Outlook on the web. Use your Microsoft 365 email address and password (your 123 Reg username and password won't work here).
2. If you'd like to open another mailbox in a separate window:
   
   • In the upper-right, select your user icon and then Open another mailbox.
   • Enter the email address you'd like to access and select Open.
3. If you want to add another mailbox to your folder list:
   
   • Right-click Folders on the left.
   • Select Add shared folder.
   • Enter the name of the email address you'd like to add and select Add.

More info

• Find out how to open and access a shared mailbox from Microsoft.
• Create a shared mailbox so multiple people can send and receive email from the same address.