Hi sfhomes: Ta Da- Got it. In Thunderbird (both Linux & Windows) I just went to TB program; clicked help; Troubleshooting Information; Profile folder (opens automatically) ; copied Windows TB Profile folder to a flash drive that was formatted in NTFS, then to Linux TB program; clicked help; Troubleshooting Information; Profile folder; (opens automatically) and followed your newest instructions below:" Linux doesn't have a Profiles folder, so all profile folders are subfolders of .thunderbird, and the two ini files from Windows should be copied into the .thunderbird folder. So, copy the contents of the Windows Profiles folder, i.e. the profile folder(s), into an empty .thunderbird folder in Linux. Copy the two .ini files, plus the other contents of the Thunderbird folder, i.e. Crash Reports, Pending Pings and registry.dat, into .thunderbird, after deleting any existing versions already there." My TB didn't have a ".dat" file but everything migrated perfectly.