This article has the instructions on adding a second mailbox to your existing Exchange profile in Outlook 2010/2013. This way you will be able to access both mailboxes at the same time and run them both in Cached Mode.
Note: The other way to add an additional mailbox is to enable Full Access permissions for it and open it in your Outlook. Read the Knowledge Base article on How Do I Add Someone Else's Mailbox To My Exchange Outlook Profile?.
Adding a mailbox to your profile in Outlook 2010/2013:
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