Default Calender for MAC Outlook 2011

I am trying to synch my Outlook calendar with my Iphone4.  However, when I do so, I get a different calendar to that I use on a day to day basis which only has a few records.  I think this may be because  I originally imported by calendar that I use - the only calendar I see when I click "Calendar" in Outlook"  - and that the Iphone may be synching with another calendar hidden somewhere in "User Data".  I think I may need to rename the default calendar under "User Data" to reflect the calendar that I am actually using in Outlook.  Any thoughts/advice?