Sync Outlook 2010 calendar with my iPad using iTunes 11.1.3.8 : only from PC to iPad is working !

Using iTunes 11.1.3.8 to syn my Mini Ipad with my PC running Windows 8 and Outlook 2010 : Calendar is only synchronizing in one direction (from PC to Mini iPäd). All calendar entries done on my Mini iPad are NOT appearing in Outlook 2010, while all entries made in Outlook 2010 are correctly appearing on the Mini iPad. Has somebody ideas how to configure ? (I didn't find any parameter for the synchronization directions in iTunes ?). Thank you.