Alternativa Greasefireu za Thunderbird s komercialno licenco

• Thunderbird
  Vse platforme Windows Mac Linux Chrome OS Android iPhone Windows Phone Apple Watch iPad Android Tablet Kindle Fire Web Self-Hosted Software as a Service (SaaS) Firefox Opera Safari Vivaldi Browser SeaMonkey BSD PortableApps.com Microsoft Office Outlook Electron / Atom Shell Chrome Microsoft Edge Thunderbird Yandex.Browser Maxthon Sunbird Neovim
• Trgovsko dovoljenje
  Vsako dovoljenje Brezplačna licenca Open Source licenca Trgovsko dovoljenje