Further development. I can manually download emails (Username > Get messages) from Google but only 11 at a time

Also just noticed that the account name in my screenshot above is *Hidden for privacy*@gmail.com (pop3) whereas the other accounts don't have pop3 after them.

It says that there are 33 emails in the Inbox. Are you saying that they aren't there? Or are you saying that there are emails in the Inbox of your webmail for this account but that they're not being downloaded?

There are over 1000 emails on Google that have not downloaded. I can now download 5 at a time by using GET MAIL

re : Also, it does not appear in my inbox.

I presume you mean it's not included in the Unified Inbox list

• Right click on Unified Inbox folder and select 'Properties'
• A new small window opens
• Click on 'Choose' button
• Scroll to the relevant account name and select the 'Inbox' checkbox
• Click on 'OK'
• Click on 'Update'

re :The relevant account settings are identical to the other accounts in the unified inbox

Do you mean - all of the accounts are set up as POP mail accounts ?

Account Settings must be ok if you can download even only a few.

When you download pop account emails for that account, do you have the setting to 'Leave messages on server' ? If yes, As Pop accounts are unable to access and use the server Trash folder, it means even if anything is deleted manually in pop account, it does not get properly deleted off server, because at best, only the 'Inbox' label might be removed meaning all of those emails are still stored in the server 'All Mail' folder.

Gmail has a quota for storage and if person is using Pop they may have more emails on server than they realise. I've come across this sort of thig before when gmail has been known to start being awkward if there are a lot of emails still stored on the server. Gmail expects people who use POP at some point to logon to webmail and remove a load of old emails because they have already downloaded a copy. Pop accounts do not synch with server folders, so whatever they get downloaded to Pop account in Thunderbird is a true independently stored copy. If you have too many still on server and it gets full, then you end up with server not able to receive or send emails. A situation you need to avoid.

I would suggest you logon to webmail account and delete a load of old emails (those previously downloaded). You should find them possibly in the Inbox, but definity in the 'All Mail' folder. In 'All Mail' - if any do not have any labels then it's possible those were emails previously deleted - gmail has just deleted the Inbox label not the email itself.

Deleting emails off server seems to make gmail 'happy' and has been known to improve the situation. So this is worth trying.

Then - after deleting a load of emails off server via webmail - in Thunderbird, select account and use 'Get Messages' and see if the download improves.

Please report back on what you found in webmail account and whether doing the mass delete off server suddenly started to improve the download.