How do I display multiple accounts in navigation pane?

I have Exchange and POP email accounts. In Entourage I could have a folder for each account within the Navigation pane. I've not been able to find instructions for getting more than the default account (the Exchange acct) to show in the Navigation pane. I do not want to create another Identity. Right now I cannot figure out how to view mail in any of my 3 POP accounts. These accounts were imported from Entourage 2004 into Entourage 2008 and then into Outlook 2011. According to Tools > Accounts these POP accounts do exist within Outlook, but they are not showing up in the Navigation pane. When I'm in hte Accounts folder I notice that only the Exchange account has a green button next to it. How does one get a green button for the POP accounts (if that is what is needed to make them active in Outlook).