Ensure that Outlook 2007 is enabling the iPhone to connect with it. Try these steps if the sync is not working with Outlook 2007.
- Open Outlook 2007 and click Tools > Trust Center.
- Under Categories, click Add-ins.
- Under Details, look for iTunes add-in under Inactive Application Add-ins.
- In the Manage box, click COM Add-ins, and then click Go.
- In the COM Add-Ins dialog box, select the iTunes sync add-in.
- Click OK.