If you have someone in your organization that you trust enough, you can share an email inbox. This feature can be extremely useful for business partners or assistants. You can also share your calendar, tasks, notes, and contacts using the same method.
Once someone has shared a folder with you, you can manage another user’s mail.
Click the File tab.
Click Open & Export.
Click the Other User’s Folder button.
The Open Other User’s Folder dialog box appears.
Enter the sharing user’s name and click OK.
Now you can manage the other user’s mail.
If you have not received permission to view a folder, a dialog box asking if you would like to request permission to view the folder appears. Click Yes, then complete the email permissions request, and click Send. If you are granted permission to view the folder, you will receive an email from the contact.
From the sharing invitation that you receive from the individual sharing their folder with you, click the Open this folder button to open the Other User’s Folder.