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Orage vs Thunderbird: catalog facts
Orage	Thunderbird
Free Free and open source as part of the Xfce project.	Free Free forever, funded by donations.
Linux	Windows, macOS, Linux, Android
Light on resources Uses the standard iCal format with import and export	Unified inbox across every account, or each account kept separate, your choice Mail, calendar, contacts and tasks in one application rather than four
Single user only, no group calendars Linux desktop only	The interface carries a lot of history and can feel dense next to a webmail tab Major ESR releases have historically been disruptive for add-ons and settings
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: MPL-2.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 20, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.