Hello, I upgraded to your 'unstable' version of Mozilla Thunderbird for email last year. The past few months it has been taking as much as 5 minutes before it opens up to the home page (in box). And in the past few weeks, the New Message icon top left of home screen has disappeared. So, I can only send emails to people who are already in my inbox, and trash box, by clicking on reply. I can't send an email to a new person that I want to email for the first time ever. Is it possible to go back to the old version of Thunderbird? How would I do that, and would I lose all the emails currently in my inbox, and in my Files? Gwen J. Barry Lwr Sackville, N.S.