PROBLEM: You try to download your POP3 emails but Thunderbird just keeps saying “Downloading Message 1 of x (where x = number of email messages on your webmail) and nothing happens.
POSSIBLE SOLUTION: Close Thunderbird. Login to your webmail account (use your internet browser and login using your credentials and web address given by your email service provider). Go to your Inbox section on your webmail and check for file sizes of the email messages you have received. Most likely, you have received a message that has a HUGE file size and is causing your Thunderbird to get stuck! I once received an email with a 12MB attachment. That’s too big! Only after deleting it did my Thunderbird start working and downloading my email messages again. This might work for you as well! If this doesn’t work, then try deleting the oldest message that you see via webmail access. Perhaps, that email message is corrupted and Thunderbird can’t “read” it. After following the above steps, open your Thunderbird software and click on “Get Mail” again.
Let me know if this solution has helped with your Thunderbird message downloading issues. Cheers!