I&#x27;m using TB since two years, when Apple Mail failed to load after an OSX upgrade. I wanted to move, preparing for moving to Linux later on. I have several family members using TB on Windows. My mother used Eudora for years, I believe seven years after development stopped. It never had a problem. I could copy it to Windows 7, just copying the folder with the program files in it, and it all worked.<p>How big is the risk if TB development stops altogether? What security risks are there when you keep using it?<p>My mother cannot handle changing to something new anymore. So I guess I have to take the risk.