How do I change the install of Thunderbird (v. 63.0.3) from IMAP to POP?
None of versions 60.3.0, 60.3.2, or 63.0.3 (tried v. 63 because my ISP Inbox is full, and I thought the beta might give extra install options) installed as POP3; they all defaulted to IMAP. I can view email in IMAP, but can't download it to my computer. I can use IMAP If I can actually download the emails, not just view them. I haven't found a way to do that. (Also POP3 is preferable on my ISP, since email downloads much more quickly.)
There is a help article to change install to POP (https://support.mozilla.org/en-US/kb/faq-changing-imap-pop), but that seems to be for a previous version(s) of TB. There is no longer an Account Settings option under the Tools menu; it simply goes to a new tab and that page contains nothing I could find about account settings, or changing (installing) TB as POP3.
Thanks for your assistance!
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To go to account settings:
At the top right of the Thunderbird window, click the menu button 
> Options > Account Settings
Thanks for the further info; I had missed that part of the menu. There is no Account Settings option I could see under Options. (I looked through all the higher level as well as lower level menus under Options.)
Another possible solution: is there a direct way to edit something like an .ini file to change the method of download from IMAP to POP? TB has to know which method to use, what I would be doing if I could get to the Account Settings you mentioned.
There is no Account Settings option I could see under Options.
Please post a screenshot. https://support.mozilla.org/kb/how-do-i-create-screenshot-my-problem
is there a direct way to edit something like an .ini file to change the method of download from IMAP to POP?
No.
Hi christ1,
Sorry for the delay in responding; the power supply on my desktop went out, and when I downloaded TB to my laptop, I wound up with the same IMAP vs POP problem. I did find [Menu icon ] > Options > Account Settings > Server Settings with Server Type: IMAP Mail Server.
Under Account Settings > Account Actions ( bottom of the menu), it appears that I might be able to change to POP3 on another account I have at the same ISP. Could you step me through that? Also, is there a way to change the existing primary account from IMAP to POP without losing the email in that Inbox?
If that isn't possible, how do I download what's in the ISP's Inbox to my Inbox, so I can free up space on the ISP's Mailbox? Thanks again!
Under Account Settings > Account Actions ( bottom of the menu), it appears that I might be able to change to POP3 on another account
No, you cannot change an existing account.
is there a way to change the existing primary account from IMAP to POP without losing the email in that Inbox?
You already posted the link to the support article in your OP. Follow these instructions.