Hi, Today I upgraded my Thunderbird to the latest version (78.2.2). I have been using Thunderbird for more than 10 years and I love it. Now I can't receive or send mail for none of my six email addresses anymore. I have a sort of Exchange-mail (https://promail.crossnet.net/owa/), but that hasn't been any problem before. Now it look's like I need to purchase an add-on like OWL or ExQuilla for each email account. Is that a fact or is it only temporary? There is no problem using Windows built-in email client, but that really sucks.. Thank's for a great job!! Kind Regards Joakim Claesson