Hi everyone, I recently downloaded a version of Thunderbird 38 for use on an older Mac (older than the one I’m using to create this post). Now, I’m trying to set up OAuth2 to comply with Google’s new requirements for Gmail, but the final steps (authentication, generation of an OAuth2 token) never finish. This is what I’ve done so far: The Gmail account that I want to set up with OAuth2 is set to IMAP for incoming (I had to create a new account in Thunderbird for this) and SMTP for outgoing. OAuth2 is selected in TB for both servers. The Google login window pops up, and I can enter my information and click “Allow” for TB to access my Google Account. After that, though, the process just runs. There’s a blue circle near the top left corner of the TB window (next to the word “Inbox”) that keeps spinning, and a line of diagonal blue stripes in a small graphic at the bottom of the window keeps moving to the right, but nothing else happens. This will go on for hours if I let it. I can take other actions in TB (change settings, etc.) while this is going on, and no error message ever appears. I should also note that I get alerts from Google (which I can access via other devices) about a new sign-in, and the computer in question shows up in my Google Account screens as being signed into my account. I have also recognized the new sign-ins by clicking the “Yes, it was me” button. Therefore, it appears that TB has successfully connected to my Google Account; I just don’t know why the authentication won’t complete itself. Should I let it run, even with the understanding that it might take several hours? Here are some further details, based on what I’ve read while doing research on my own: -Cookies are enabled in TB (“Accept always,” “Keep until they expire”). -Two Google-based cookies have appeared (google.com, accounts.google.com). -My computer’s firewall is off for the time being. I don’t have any antivirus software, as this is a Mac. -My “User Name” in the Server Settings window is my full e-mail address. -There is nothing written in the “Saved Passwords” window. -I’ve tried shutting my computer down entirely and then restarting the authentication process. -I don’t think my computer can run any versions of TB that are later than 38. -Specific incoming/outgoing settings: IMAP port 993, SSL/TLS, OAuth2 for incoming; SMTP port 587, STARTTLS, OAuth2 for outgoing. I really need to access my Gmail on this computer, but am not a tech person and have run out of ideas to try on my own. Any help would be *greatly* appreciated! And, of course, I’d be happy to provide additional details if necessary. Thank you!! P.S. If it would be simpler to use my original POP account with 2-factor authentication, then I would be open to doing that instead. I just haven’t been able to find out if “app passwords” are compatible with TB 38.