If you receive an email notice that you have been granted access to share another person's mail folder, you can accept or decline the share.
When you accept the share, the shared mail folder displays in your Folders list in the Overview pane.
Click Accept Share in the email. The Accept Share dialog opens and describes the role granted to you.
Before you accept, you can change the mail folder name and select a color to high-light the folder.
(Optional) Select to send a confirmation back to the Grantor.
Click Yes. The mail folder is added to your folder list. The message is moved to your Trash folder.