Disable Cache Mode for Additional Mailboxes that are added to your mail profile.

Scenario:  You want to only cache your primary mailbox in your mail profile, but you do not want to cache the additional mailboxes that were added to your mail profile.

Resolution:  Uncheck Download shared folders under your cache settings:

1. Within Outlook 2013/2010, click on the File tab, click Account Settings in the Account Settings list.
2. In the Account Settings dialog box, click the E-mail tab and then double-click your Microsoft Exchange Server account.
3. In the Change Account dialog box, click More Settings.
4. In the Microsoft Exchange dialog box, click the Advanced tab.
5. Click to clear the Download shared folders check box. (The screen shot for this step is listed below).

   

6. Click OK two times.
7. Click Next, click Finish, and then click Close.
8. Restart Outlook.