Stable packages aren't ready for Thunderbird 60 presence. It's better to wait for better repository consistence before adding this update.
- Bug#909000: Thunderbird 60 cannot STILL be at stretch ... Narcis Garcia
- Bug#909000: Thunderbird 60 cannot STILL be at str... Jonas Meurer
- Bug#909000: Thunderbird 60 cannot STILL be at... Paul van der Vlis
- Bug#909000: Thunderbird 60 cannot STILL be at... Narcis Garcia
- Bug#909000: Thunderbird 60 cannot STILL b... Carsten Schoenert
- Bug#909000: [Pkg-mozext-maintainers] ... Daniel Kahn Gillmor