Could I ask again for help, please. Thunderbird is running fine, I know where my mail is stored on D:, I can identify my Profile, which is on C:, and I have the app ready to install on D:, where previously I had mistakenly left the app on C: and tried to move Profiles and Mail to D: . It would seem if I ran the install on D: I can begin the process of starting again with TBird installed on D:. But this is where I need some help. If I then start by entering settings for one of my mail accounts I presume thereafter all TBird data will then be on D:? Once this one account has been set up, how can I then add on all my previous settings, Profiles and Mail, to my new installation on Drive D:? Am I missing anything here? I am presuming once this one account is setup I can then repeat this process fro my other accounts. I would then want to remove anything Thunderbird from drive C:.