These steps will make your manager’s email folders available to you automatically, every time you use Outlook. (It might not be your manager. But for this example, it makes the sentences easier to read if we pretend it is.)

The manager must first share their mail folder(s) before these steps will work. Once they’ve given you rights, you can follow the steps below.

1. Click Outlook’s File tab.
2. Click the large Account Settings button, then select Account Settings from the list that appears.
3. In the Account Settings dialog box, click Change.
4. Click More Settings. A small dialog box will open.
5. Click the Advanced tab, then click Add. A tiny dialog box will open.
6. Type the NetID of the person whose mailbox you want to add to your user profile, then click OK. Exchange will show the name of the person you just added. 
7. Click OK to close the Microsoft Exchange dialog box.
8. Back on the Change E-mail Account dialog box, click Next, then click Finish.
9. Click Close to exit the Account Settings dialog box.
10. Quit Outlook. Even though you may already see your manager’s mailbox listed after your mail folders, don’t be fooled. You must quit and restart before things will work properly. Trust us.
11. Restart Outlook.

In the Mail section of your Folder Pane you should now see an additional Mailbox with your manager’s name.

Be very careful when working with multiple accounts that you choose the right one before starting a task like creating a meeting invitation or sending an email.