I've installed Thunderbird 45.4.0 but I can't find where Thunderbird hides my profile in OS X 10.11.6. I had hoped to copy my mail folder complete from Win7. I cannot finding it where the Web says it should be.
Dave
If you have or haven't been successful with this:
In Tbird go to Help->Troubleshootung Information look for the tab that indicated Profile Folder and click the button to "Show Folder". Note that this doesn't show you a link to where the folder is located, it just opens the folder in whatever is your default file explorer program(ie. in Win10 Windows Explorer).
But I'd recommend that if you want to sync or move Tbird profiles between OSes .. then you're better off using the import/export tool.
Tools-> ImportExportTools-> Export profile(from Windows) .. to somewhere that is shareable between both OSes.
What it does is to copy that profile's entire folder contents to a location of your choosing and names it with your profiles orginal name plus the date and time it was exported .. it'll make sense once Thunderbird recovers from creating it(ir will become unresponsive and appear to throw an errors, but should be ok!) then navigate to the path you set the profile backup and you should see your backed up profile folder.
hope that works.