
This article describes how to sync Google, Outlook, and iPhone calendars using the third-party app Sync2. These instructions use to Outlook 2019, Outlook 2016, Outlook 2013, Outlook 2010, and Outlook for Microsoft 365.
How to Sync Google, Outlook, and iPhone Calendars
If you wish to enter an appointment in Outlook and have it show up in your Gmail and iPhone calendars immediately, set up the Sync2 app. Sync2 keeps Google Calendar, the Outlook calendar, and iPhone Calendar in sync instantly on a Windows PC running Outlook. Here’s how:
Download Sync2 and run the setup file.
Although Sync2 is a premium paid application, a totally free trial is available.

Select the free trial or paid version on the setup wizard and select Next.
Choose Google Services and select Next.

Choose Microsoft Outlook Calendar and select Next.

Select Login to Google and enter your Google account information to log in. Allow the connection if prompted and select Next.

Select Next and choose Finish to apply the settings. Wait while setup completes.
Set up Synchronization With Your iPhone
After synchronization is set up between Outlook and Google, adjust your phone settings to allow synchronization with Google Services using the Calendar app.
Open Settings on your iPhone.
Select Passwords & Accounts.
Select Add account and choose Google.

Enter the email address connected with your Google account, choose Next, then enter your password. Select Next.
If you utilize 2-Step Verification, get in an app password rather of your routine password.
Open the Calendar app on your iPhone to see your Google and Outlook Calendar occasions.