If you are using an Exchange acct, here are the steps:
Sharing sub-folders
Details: To share a folder that is not directly beneath Mailbox - user name,
like the Inbox, Contacts, Calendar, Notes, or Journal folders, you must do
the following on each folder that is higher in the folder tree.
1. Right-click the folder, and then click Sharing. (It could say change
sharing permissions)
2. Click Add.
3. Select the other user you want to give permissions to, and then under Add
Users, click Add.
4. Select the user's name in the list, and then set the permission for the
user.
NOTE: The top folder, Mailbox - Your Name, must be shared to share any folder
beneath it. The Inbox folder must be shared to share any of the folders
beneath it. You can set the Inbox folder permissions to None to prevent
others from viewing the contents.
