Hi,
Do you want to configure your Gmail account in Outlook desktop application or connect your Gmail account with your Outlook.com account?
If you mean the former, you can refer to this guide to set up your Gmail account in Outlook client:
How to set up an Internet email account in Outlook 2013 or 2016
If you mean the latter, check this one:
Add your other email accounts to Outlook.com
Hope this helps.
Regards,
Steve Fan
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