Outlook 2011, Where are the mails stored?
According to Microsoft's support site:


  Outlook stores only the indices in the Database (with a capital “D”) file and stores the data records as a series of files nested within folders. The Database file and its folders are located here:


~/Documents/Microsoft User Data/Office 2011 Identities/Main Identity/Database
~/Documents/Microsoft User Data/Office 2011 Identities/Main Identity/Data Records