Questions:

How do I grant access to my mailbox to another person?

How do I add another user's mailbox on my folder list I have been given access to?

Answer:

If you frequently work with someone else's Exchange folders, you probably will want to add the other person's Exchange mailbox to your Outlook profile. Doing so will automatically open the other person's mailbox every time you open Outlook. The other mailbox appears in the Folder Pane beneath your Exchange mailbox folders.
Before you can add an additional mailbox to your Outlook profile, the person who is sharing a mailbox must grant you Folder Visible permission on the root folder of the Exchange mailbox.

Instructions for granting Folder Visible permission:

  • As the manager, do the following in Outlook:
    1. Right-click the root folder of the Exchange mailbox, and click Folder Permissions.
    2. Click or add the name of the delegate.
    3. Under Permissions, select Other, and select the Folder visible check box.
    4. Click OK.


How to access the mailbox as the Delegate:

  • As the delegate, do the following in Outlook:
    1. Click File > Account Settings > Account Settings.
    2. On the Email tab in the list, click the Exchange account type, click Change, and then click More Settings.
    3. On the Advanced tab, under Open these additional mailboxes, click Add, and then enter the mailbox name that you want to add to your user profile. If you do not know the mailbox name, ask the person who granted you Delegate Access permissions.

 
To open another person's folders: 

  1. Click File > Open & Export > Other User's Folder.
  2. In the "Name" box, enter the name of the mailbox, or click Name to select from a list.
  3. In the "Folder type" list, click the folder that you want to open.