Method 1
1) Open Outlook
2) Click on File

3) Click on Open & Export

4) Click on Other User’s Folder

5) Enter the name of the mailbox, and set the folder type to either Inbox or Calendar

6) Press OK
Method 2
1) Open Outlook
2) Click on File

3) Click on Account Settings and then Manage Profiles

4) Click on Email Accounts

5) Click on your email, then click on change

6) Click on More Settings

7) Click on Advance

8) Click on Add

9) Enter the mailbox name

10) Click OK

11) Click OK

12) Click Next

13) Click Finish

14) Click Close

15) Click Close

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