My Gmail Notes:
- You can use either IMAP or POP3 (in email client) to access your Gmail account . You can allow either or both in gmail.com Settings. I have both Enabled. On mobile devices (iPhone and iPad) I use IMAP. As you know, that's a complete copy of everything in the account (including old emails). Works fine for that. But I don't think I need a whole copy of what's up there stuck in my Outlook PST file (it's big enough already), so I use POP3 in Outlook (and only keep the important emails that come in).
- If you send an email to yourself in Outlook (through the Outlook Account you have setup for Gmail) it shows in Inbox AND Sent Items, in both Outlook and Gmail.com (pretty cool).
- Since Outlook is considered "Less Secure" , in main Google Account Settings / Security (not gmail.com Settings) you must set "Less Secure App Access" to ON. Requires login using Secure Password Auth. (SPA)
- At one time Gmail Account was working without an App Password and I had 2-Step verification OFF. But now, 2-Step Verification is Enabled, and you create this password in main Google Account/Security (not Gmail Settings)
- So, for my iPhone and iPad, this gmail account seems to work as IMAP, but in my desktop Outlook-2016, more like POP3.
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Less secure apps & your Google Account - Google Account Help
In 6-2022, Diane Poremsky suggests:
Gmail accounts stop syncing with Outlook after following Google's recommendations to secure your Gmail account.
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