How to Fix It When Your iPhone Calendar Is Not Syncing With Outlook

Sometimes you can have too many calendars on your iPhone

A women checking her calendar apps on iPhone and iPad.

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An iPhone calendar not syncing with an Outlook calendar is a common problem experienced by many users. It can also occur with other iOS devices like an iPod touch or iPad.

Sometimes events entered into the iOS Calendar app don’t appear in the correct Outlook calendar while at other times an Outlook calendar on iPhone may be missing important data.

Fortunately, there are a variety of strategies for dealing with this annoying bug.

Causes of Outlook Calendar Not Syncing With iPhone

Some of the most-common causes of iPhone calendar events not syncing to Outlook properly include:

  • The incorrect calendar being selected when creating an event.
  • Data not syncing to the server properly.
  • An Outlook account not being connected to an iPhone.
  • The iOS default calendar being incorrectly configured.

How to Fix iPhone and Outlook Calendar Syncing Problems

Here are all of the proven strategies for fixing iPhone Outlook calendar sync issues listed from most-common and easiest to least-common and more time consuming. It’s recommended to work through these solutions in order to effectively pinpoint the cause and correct it.

  1. Change to Wi-Fi. For iPhone and Outlook calendars to sync properly, the data needs to be sent to the online servers, then re-downloaded to the other device. Data syncing can be delayed when your iPhone is on a cellular connection to save data so try to connect to a Wi-Fi signal and see if that works.

  2. Disable Airplane mode. If you’ve had Airplane Mode turned on while watching a movie or during a flight, none of your data will sync properly, as your iPhone will be unable to connect to the relevant online servers. Check to see if Airplane Mode has been turned on, disable it if it has, connect to a cellular or Wi-Fi signal, and wait a few minutes.

  3. Turn off Low Power Mode. When your iPhone battery gets low, Low Power Mode is activated. This mode disables most background activity including downloads and data syncing between services.

    Charging your iPhone usually disables this mode automatically but you can also manually turn it off. Go to Settings > Battery and tap the Low Power Mode toggle switch.

  4. Close all of your apps. Sometimes apps on iPhone can get glitchy and the best way to fix them when this happens is to close them completely and then open them again.

    Minimizing an app on iOS or switching to another app doesn’t mean you’ve closed the previous app. To close an app fully, perform a long swipe from the bottom of the screen to the top to pull up all of the open apps, then swipe down on each app to close them.

  5. Restart your iPhone. Restarting a device to get it to work properly is a bit of a cliché but it works.

    Simply pressing the power button on an iPhone just puts it to sleep. This isn’t a restart. To restart an iPhone you need to shut it down completely, then turn it back on.

  6. Install the latest Outlook app updates. App updates frequently contain fixes for problems such as the Outlook calendar not syncing properly. Sometimes they’re even required to make sure that apps work properly with new iOS operating system updates.

    To quickly check for app updates, open the App Store on your iPhone, tap Updates, then drag the list of apps down and release your finger.

  7. Ensure you’re logged into the correct Outlook account on your iPhone. Go to Settings > Passwords and Accounts. If Outlook isn’t present on the list of accounts, tap Add Account to add it.

  8. Check your Outlook permissions. Even if you’re logged in properly with Outlook, you may not have granted the service full access on your iPhone. Go to Settings > Passwords and Accounts > Outlook and make sure the Calendars toggle switch is turned on.

  9. Check your iPhone’s default calendar. Go to Settings > Calendar > Default Calendar. You may have several calendars listed here, including a few Outlook ones. The calendar with the check next to it is the one where new events created on your iPhone will be placed. Make sure your preferred Outlook calendar is the one checked.

  10. Make sure you’re using the correct calendar in the iOS Calendar app. If you’re having trouble with your iPhone calendar not syncing with Exchange or Outlook, you may want to double-check how you’re making new entries within the iOS Calendar app.

    When creating a new event, tap Calendar to make sure your Outlook calendar’s name is checked. You may have been saving events to the wrong calendar.

  11. Perform a manual iTunes sync. If you have the latest versions of iOS and Outlook installed on your iPhone, calendar data should be syncing via the cloud in the background.

If you’ve tried all of the tips mentioned above and nothing’s worked, you may want to try a sync via iTunes. First, connect your iPhone to your computer via its cable, open iTunes on your computer, then select Devices > iPhone > Info > Calendars > Sync calendars from > Outlook > All calendars > Apply.