How to enable your iPhone to sync with the Outlook 2010 or 2007 Calendar in Windows.
1. Open iTunes and connect your iPhone to the PC.
2. Select your iPhone on the left pane.
3. Click the Info tab toward the top of the screen.
4. Under the Calendars section, turn on Sync calendars from Outlook. Set any of the other options listed as needed.
5. Click Apply and you’re done.