Outlook 2016 will not take gmail after end of May 2022

If you're attempting to add a Gmail IMAP account, you need nothing else, Outlook 2021 supports Oauth2 (A.K.A. Modern Authentication) for IMAP service, and Gmail thereby considers it a "Secure App". All you'll need is your user account and standard Gmail password, no 16-digit App Password is necessary.

If, OTOH, you're attempting to add a Gmail POP account, NO Outlook version supports Oauth2 for POP service, so you would need to generate and use a 16-digit App Password in this case.

TL;DR

Outlook 2021 + Gmail IMAP = standard password

Outlook 2021 + Gmail POP = 16-digit App Password

With your assistance I was able to perform the steps .....to configure my Installed copy of Outlook 2016 to Fetch and send emails from my 4 gmail accts...as you wrote:

"turn on 2-Step Verification and then generate an App Password. Open Outlook 2010, bring up your Gmail account in Account Settings, and replace the existing password with the 16 digit App Password you just generated."

I have now purchased a New Windows 11 laptop and a New Copy of Office that includes Outlook 2021.

As I recall, when securing the 16 digit App Password...there was nothing that alerted you to writing down, or copying that code for safe Keeping. However I did so for 3 out of the 4 gmail accts.

I know this process cannot be complicated by Google...or at least I hope so...so that when you purchase and will be using a New Outlook program on a new PC....that getting the accts in the New Installed Outlook (while the prior Outlook version is on use in another PC)to fetching & Send gmail emails.....can be accomplished. Before this google chnage all you had to do is enter your Passwords you created in a new...additional Outlook on another PC....but with this new Security....what do I do?

Yes, I eventually got it to work for me after starting the two-step authentication on Google and putting that app password into the Outlook account. Had tried it before but worked this time.

Worked for me on Windows 7 SP1 / Outlook 2016 - no 365

Thanks!!

It does work if you follow the steps correctly. I've done it on PCs running Windows 10 and Office 2003 and on PCs running the latest update to Windows 11 running Office 2019.

With Outlook open, click on send/receive. A pop-up window tells you the username/password isn't valid. Open you browser and log into to your Google account and follow the steps listed to allow 2 step authentication and generate a PW. Copy and paste that PW over your old Outlook PW and you should start receiving your emails. You won't see that pop-up about the invalid username/password again.