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Thunderbird vs Orage: catalog facts
Thunderbird	Orage
Free Free forever, funded by donations.	Free Free and open source as part of the Xfce project.
Windows, macOS, Linux, Android	Linux
Unified inbox across every account, or each account kept separate, your choice Mail, calendar, contacts and tasks in one application rather than four	Light on resources Uses the standard iCal format with import and export
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	Single user only, no group calendars Linux desktop only
Downloadable app	Downloadable app
Open source	Open source
License: MPL-2.0	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked October 2, 2026

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