Hello there. Bussiness12 We have read your message. We try to help you. Only this message appears? Are there no further pc problems? Can you send me a picture of the exact message? We can try to Open Thunderbird. From the Tools menu, click Options. Click Advanced. Click Network & Disk Space. Increase Connection timeout from 60 to 120. If problem persists, increase timeout. But you deleted that old server account. Perhaps thing had stuck on your computer machine. Try to delete any profile of that old server account. Some configurations from both sides had to be deleted. For better performance. And no more pop-up s. Greetings Firefox volunteer.