Installed Thunderbird on new Windows 7 Pro PC. Used Profile Manager to create profile and checked "Use the selected profile without asking at startup." Copied the contents of the Thunderbird profile folder from another PC running Windows 10 into the profile folder of the new PC. Profile.ini has the correct information: [General] StartWithLastProfile=1 [Profile0] Name=David IsRelative=1 Path=Profiles/slj17w49.David Default=1 When I run Thunderbird it displays a window "Welcome to Thunderbird: Would you like to create a new email address." It does not display any accounts or messages. When I look at the files and folders inside the profile, the Date Modified on many of them is the current date/time, so Thunderbird seems to be loading the profile. It's like one part of Thunderbird knows about and loads the profile, but another part of the program doesn't know that it loaded the profile! Please help!!! Please help! I will pay for help if necessary. I followed the instructions on https://support.mozilla.org/en-US/kb/profiles-tb#w_restoring-to-a-different-location and it doesn't work. Does Thunderbird on Windows 10 have a different file structure from Thunderbird on WIndows 7? Maybe that's why it doesn't work.