I received a question onscreen re updates to thunderbird. I clicked yes. No updating appeared to happen and now the programme has gone. Does not exist in program list. Only in documents is a thunderbird folder with some a profiiles folder and an updates folder. Neither are active. Dated years ago. When I click my tb icon it says thunderbird.ese has moved or been changed and invites me to delete the icon. Surely I haven't lost ten years of data??