The Google account permissions window appears. Have you already added your Gmail account to Outlook then see, Improved auth for existing Gmail users. This is for users who are on Build 0902 and higher. This video shows the steps to get the iCalendar ICS URL from Google Calendar as well as add it to Outlook. Sign-in to your Gmail account within Outlook for Mac. Subscribe to a Google Calendar Video Tutorial Updates made to the calendar online should sync down to Outlook hourly. Changing settings to 'allow less secure apps' means removing two factor authentication on my Google account. Generating an app password does not allow me to add my Gmail account to Outlook for Mac. I have two factor authentication enabled on by Google account. You can't add appointments in Outlook and have them sync up to the server. I'm running Outlook for Mac version 15.35 under an Office365 license.

On this page, simply select Turn on from the two options. Under Change account access for less secure apps, click the link to the Less secure apps to open your Gmail account access settings. The calendar will sync to Outlook but it is read-only. Click the link Learn more inside the email to be taken to a support page explaining limited access for less secure apps. Enter a friendly name for the calendar and return to Outlook.

Paste the URL in the address field. It's no longer necessary to remove the S from the HTTPS URL, but if Outlook won't download or gives you an error, remove it.

In Outlook, go to File, Account Settings, Internet Calendar tab.

Right-click on the URL and choose Copy.

If you choose the Public Address, you need to enable public access on the Share this calendar tab.

Click the ICAL icon for the Private Address.

For users seeking Gmail backup to Outlook, Gmail backup tool is the best approach.

Move the mouse over your calendar name then click on the caret to the right of the calendar name to expand the menu. You can configure a Gmail account in Outlook is possible via Account Settings.

The Google Calendar Sync Utility utility will work with Outlook (all versions). It's still going to be read-only, but avoids the occasional send and receive errors a subscribed calendar generates. The shared calendar syncs with the account. Another option, if you use, is to subscribe the calendar in.

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