Do you know where this 'Program1' is located on your computer? If so close Thunderbird, open Windows Explorer, drill down to the offending folder. right click on it, click rename in the drop down menu and rename it Program. See if that fixes your problem. Any help?

Have you made any progress?

I think that's one of those programs that people either love or hate. Not much in between. Here's a thread from an email forum on the subject. The site's email guru has a bit about his negative experience with the program (mainly its company's 'shady' practices). Take it FWIW. :-)

It IS a very strange situation, indeed. And here's some more weirdness. None of the e-mails stay on the server...I double checked and everything was downloaded, per the settings. When I first started looking for a prog to replace WLM, I started using Outlook....but the e-mails were disappearing from the Inbox. I thought it was a problem with Outlook and even posted a query here on the forum. Never solved that issue, but disliking WLM more as time went on, I gave up on Outlook and thought I'd try Thunderbird. Then the same thing started happening! I had made TB the default and set WLM to NOT check automatically for mail....BUT...when I would open WLM to look at something in a folder there, it would check for mail on Startup and all my e-mails would show up. That's when all the messages in TB would disappear. When I realized this was happening, I opened Outlook, sent some test messages there and watched as they disappeared before my eyes when I opened WLM. Do you think maybe I'm incorrect about the mail staying on the server? Wouldn't I see it there when I go online to check?