Original Title: Outlook Question

 I recently downloaded Microsoft:Mac 2011.  I've added my Outlook and Yahoo email accounts.  However, when trying to access my inboxes via the "O" icon, I am not able to see the accounts, send or receive messages.  Is it necessary for me to have a previous version of Microsoft in order to utilize Outlook?  I can log into my Outlook account by going to Outlook.com.