I use Thunderbird on my Desktop and recently put it on my new Laptop. Version 78.7.1 is installed on the laptop. I also use another app on my iPhone, and they all access my email account that is with my website. There is perfect Syncing between Desktop and phone app. But on the Laptop, mail read and/or deleted on the other devices still show up as New Unread Mail, so no syncing. However if I read or delete an email on the Laptop it does reflect that on the other devices.

Any ideas? Thanks Dan