I copied the .thunderbird folder to another folder on my computer (Ubuntu on Dell Laptop) for backing up, when I re-opened Thunderbird my accounts appear gone and it is asking if I want to set up email etc;. I then deleted the duplicate .thuderbird folder hoping this would fix it. On opening Thunderbird it still acts as if this is a new install - the .thunderbird folder and files remain in the original location I am hoping there is a simple fix. Any ideas? - and yes I have looked at a lot of online documentation!