Now it's time to sync your Outlook calendar with your iPhone X/iPhone 8 in iOS 11. If there is a new iTunes update available, follow the onscreen instructions to update your iTunes to the latest version. If there is a new version of iTunes or macOS available, click Install to update your iTunes to the latest version. How to update iTunes to its latest version:
All you need to prepare before synchronizing your Outlook and iPhone calendars is to update your iTunes to the latest version following the steps below to avoid problems like iPhone not connecting to iTunes. Being different from the way to sync Google contacts with iPhone X/8/7, which requires iCloud to work, syncing Outlook calendar needs iTunes to get things done. With the help of iTunes, you can easily sync your outlook calendar with your iPhone X, iPhone 8 or iPhone 8 Plus in iOS 11, which helps you to view your calendar details on your iPhone.