Sync to Outlook calander-wont syng, just keeps running

When syncing my phone with outlook it will not sync, it keeps going on and on and on.. Somes at the op up by th time in the screen I see the sync circle on the right and sometimes the sync circle is on the left when my phone is connected to my computer to update.. I dont know if that makes a difference, I cant figure out what I am doing wrong.. this is my second I phone and its always worked before..