Uninstalled and reinstalled TB. Now asked for password but stuck on downloading message 1 of 63, then exits download task. Webmail shows all messages 593KB or smaller.

What was the reason to remove the password? Slow incoming messages can always be caused by a temporary server issue at your email provider. And did or could you have a look at the Cannot receive messages article?

Also, try to remove Thunderbird from your allowed programs in any firewall or other security software and then readd it.

The password was removed as one of the suggestions for no incoming messages. Not slow, I mean none. The suggestion was from the "Did your ability to receive mail suddenly stop? Was it working before?" section of the "Cannot receive messages" article Email provider claims no problems on their end and I can see all in the inbox using their webmail site on Internet Explorer. In Norton Security I tried cycling thunderbird between blocked and allowed. No change.

- Did you read the article linked to by "check if your antivirus software is causing problems" from that article, especially about Norton Security? - Are you using IMAP or POP for the account affected? - Is Allow antivirus clients to quarantine individual incoming messages in Options > Security panel > Antivirus tab enabled, and could you disable it? - Could you try disabling Norton Security entirely? - Did you run Thunderbird in Safe Mode to test with? - Did you install or update any add-on recently? - Could anything else have been updated recently, either an add-on, Windows, Norton, Norton’s certificates, or Thunderbird itself? - What version of Thunderbird are you running?

Sidenote: many email providers tend to reply there is nothing wrong at their end while they may only notice afterwards. Also, outages/issues can include both slow and no responses at all (timeouts), and a working webmail page does not guarantee that POP or IMAP servers should be reachable - they’re often a resort in case the servers aren’t.

-Disabled Norton Security auto protect and firewall - no change - server is pop51.bellnet.ca - removed check mark for "Allow antivirus clients to quarantine individual incoming messages" - no change - ran Thunderbird in Safe Mode to test with. Also with all addons disabled - no change - no addons installed or updated recently - What is date of last TB update? My problem started on Nov 2, 2016. I did lst Windows update the middle of Oct, a couple weeks before problem started. Norton updates are done several times a day. Mostly just definitions. - Thunderbird is latest v45.4.0. I do the update as soon as message says an update is available. Do you have suggestion for another free email client I can test with? I don't own or want Outlook. I would like to keep TB if I can get it working again. I have emails stored in a few 100 folders.

I am not sure what fixed it. After doing everything in previous msg, except testing new client, I rebooted the computer and I now can get my email. Norton Security is back on and the check mark for "Allow antivirus clients to quarantine individual incoming messages" is back on. After another reboot it is still working. All is good now, thanks.

TB not able to download again this morning. I removed check mark for "Allow antivirus clients to quarantine individual incoming messages" and rebooted the computer. Still no. Rebooted computer in safe mode with networking. Worked there. Rebooted normal mode, still working. I am leaning toward Norton Security issue.