This came up when firing up Thunderbird to check email. It&#x27;s the splash screen. It disappeared later (perhaps when you checked). The Cert definitely expired, I have a screen grab of it showing the expiration date as 12&#x2F;7&#x2F;15, 7:00am. (At the point I checked it was 12&#x2F;7&#x2F;15, 9:51 AM.