Communication · paid tool
Microsoft Outlook alternatives
Email, calendar, and contacts client for Microsoft accounts.
Free alternatives
Highest score first. The score weighs licence openness, repository activity, traction, feature coverage, and cost; factors without data are left out and the rest are reweighted.
Evolution
Ranking score 86.4/100
Desktop mail, calendar, and contacts for Linux workgroups.
- Licence
- LGPL-2.1
- Platforms
- linux
- Self-hostable
- No
- Repo activity
- Not available
- Last verified
- October 24, 2026
Why this rank
Score breakdown for Evolution Factor Points Weight Licence opennessLGPL-2.1 licence (open); not self-hostable 31.8 45.5% Repository activityNo repository metadata; activity unavailable (not enough data) — 0% PopularityNo repository metadata; traction unavailable (not enough data) — 0% Feature coverage6 of 6 curated capability tags covered 36.4 36.4% Costfree pricing model 18.2 18.2% Points add up to the score. Factors without data are left out and the remaining weights are renormalised.
Betterbird
Ranking score 81.9/100
Thunderbird fork with extra fixes and usability improvements.
- Licence
- MPL-2.0
- Platforms
- macos, windows, linux
- Self-hostable
- No
- Repo activity
- Last commit October 25, 2026
- GitHub stars
- 994
- Last verified
- October 24, 2026
Why this rank
Score breakdown for Betterbird Factor Points Weight Licence opennessMPL-2.0 licence (open); not self-hostable 17.5 25% Repository activityLast activity 0 day(s) before 2026-10-26 25 25% Popularity994 GitHub stars 12.8 20% Feature coverage5 of 6 curated capability tags covered 16.7 20% Costfree pricing model 10 10% Points add up to the score. Factors without data are left out and the remaining weights are renormalised.
Thunderbird
Ranking score 79/100
Desktop email, calendar, and contacts with no account lock-in.
- Licence
- MPL-2.0
- Platforms
- macos, windows, linux
- Self-hostable
- No
- Repo activity
- Last commit October 26, 2026
- GitHub stars
- 197
- Last verified
- October 24, 2026
Why this rank
Score breakdown for Thunderbird Factor Points Weight Licence opennessMPL-2.0 licence (open); not self-hostable 17.5 25% Repository activityLast activity 0 day(s) before 2026-10-26 25 25% Popularity197 GitHub stars 9.8 20% Feature coverage5 of 6 curated capability tags covered 16.7 20% Costfree pricing model 10 10% Points add up to the score. Factors without data are left out and the remaining weights are renormalised.