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Apparently, I was wrong at some steps. I'm not sure where, though. I removed and reinstalled MailNews, and now it works again, exactly like Thunderbird did, with all my accounts working and all the info from my profile. Thanks!

But Icedove is Debian only, and I'm on Windows. It would be helpful if the differences between Mailnews and Thunderbird were explained so I could fix these issues. Is there a migration tool that will help reduce issues?

Thanks, I was able to find the folder and drop in my Thunderbird profile. However, I'm disappointed that Mailnews isn't the drop-in replacement I thought it would be: It doesn't seem to work with my other email account, Outlook. It can connect fine and load the list of messages and folders, but if I try to view the messages or organize them into folders, it just loads endlessly acting like it's doing something without ever actually finishing the task. I double-checked, and this account is using the same exact settings it used in Thunderbird--so it should work perfectly. Mailnews is also missing an important feature that Thunderbird has: The in-window email action bar. See the attached screenshot. I don't see a setting to toggle, and it seems like if there were one, it would already be in place because of the setting in my copied profile. Thanks for your help.

Okay, I downloaded the newest version from http://o.rthost.win/boc-uxp/, but it doesn't look there's any installers there; it's just portable versions. Because of that, I can't find where it places it the profile folder to make pasting my old profile into it easier. I know Thunderbird saves it in %USERPROFILE%/Roaming/Thunderbird/Profiles, but I don't see a MailNews entry there. Where does MailNews save the User Profile? Or am I just supposed to copy a file from the MailNews folder to put in the Thunderbird one to make it work with newer versions of OAuth?

I think I found the link on the page, but it seems to have been hijacked and redirects you to a malicious site: https://o.rths.ml/boc-uxp/mailnews.win32-20191026-6b769f4-uxp-565ae72f5-xpmod.7z

I can't find any information on MailNews as a client. Also, it looks like Icedove is Debian specific. Do you guys have any direct links to download a Windows version of either of these?

I'm looking for a way to get Thunderbird 52.9.1 to work with Yahoo. Any chance you could share this patched version?