I bring this little tutorial to show how to synchronize Google Calendar with both iPhone and Outlook. I use Outlook 2010 and iPhone iOS 4.0.1 for this tutorial. Outlook 2010 Download and install Google Calendar Sync . This will enable you to syncronize between Google Calendar and Outlook. Test out the synchronization by creating an event in Outlook calendar, right-click on the Google Calendar Sync icon in the notification area, and click “Sync”. Your event should show up in Google Calendar. iPhone iOS 4.x Click “Settings” and click on “Mail, Contacts and Calendars”. Click “Add account” and pick “Microsoft Exchange” (Yes, we use Microsoft Exchange in this case. It enables Google Mail, Google Contacts and Google Calendar push-notifications support) Enter your information: E-Mail Leave Domain blank Your username; put your full email here Your password Description contains the name of the account. You can leave it to the default