To access a shared mailbox from the Outlook Web client:
- Navigate to “Mail”.
- Right-click Folders in the list of mailboxes on the left side of the window.
- Select Add shared folder from the menu that pops up.
- Enter the name of the account that owns the shared folder. This can be the name of a person who has shared a mailbox with you or the e-mail address of the shared account.
- Click on the desired username/account.
- Click Add.
The shared mailbox will show up in the list of mailboxes on the left side of your window.
To “Send As…”
If you need to “be” the shared account–to send e-mail as if you were actually logged in as that account/person–you need to activate a feature in Outlook that is not on by default. Here’s how:
- Create a new mail message.
- Click on the ellipsis in the menu:
- Select Show From in the menu that pops up:
- You will now see the From field has been added to your new message:
- Now that you have activated the From menu, it must be populated. Click once on your e-mail address as it appears to the right of the From button/menu. It will not appear that you have done anything.
- Press Delete on your keyboard.
- Your e-mail address has been deleted. Now start typing the email address of the account from which you want to send a message. Select/click on the desired account when it appears.
- Send a test message to yourself or to someone else.
You have just activated the From menu and populated it with a second address from which you can send e-mail. If you have other address for which you have permission to send from, you can add them to the From menu by starting at step 5 above. You should only have to do this once for each address.
A note about signatures: If you have an e-mail signature defined, it will by default be appended to ANY message you send, no matter which account it is sent from. You can manually delete the signature from each message as you are editing it if you would rather it not be present on any given message.