NeoMutt
Mail ServersFeature-rich terminal email client
Replaces Microsoft Outlook
6 self-hosted Microsoft Outlook alternatives
Microsoft Outlook is a popular proprietary tool in the mail servers space. These open-source apps let you replace Microsoft Outlook with software you host and control yourself.
Best self-hosted Microsoft Outlook alternatives
Betterbird
Mail ServersCommunity-enhanced fork of the Thunderbird email client
Replaces Microsoft Outlook
Open Web Calendar
File Sync & StorageEmbed a web calendar into your own website
Replaces Google Agenda, Microsoft Outlook
Kontact
GroupwareIntegrated personal information manager for KDE
Replaces Microsoft Outlook
Claws Mail
Mail ServersLightweight and fast GTK email client
Replaces Microsoft Outlook
hash-calendar
File Sync & StorageLightweight calendar app where the data lives in the URL hash
Replaces Google Agenda, Microsoft Outlook
No apps match these filters.
Compare Microsoft Outlook alternatives
- Claws Mail vs hash-calendar
- Claws Mail vs Kontact
- Claws Mail vs NeoMutt
- Claws Mail vs Open Web Calendar
- Claws Mail vs Betterbird
- hash-calendar vs Kontact
- hash-calendar vs NeoMutt
- hash-calendar vs Open Web Calendar
- hash-calendar vs Betterbird
- Kontact vs NeoMutt
- Kontact vs Open Web Calendar
- Kontact vs Betterbird
- NeoMutt vs Open Web Calendar
- NeoMutt vs Betterbird
- Open Web Calendar vs Betterbird
Switching from Microsoft Outlook
Moving off Microsoft Outlook means trading a managed subscription for a service you run yourself. The payoff is ownership: no per-seat pricing, no vendor lock-in, and full control of your data. Start with the option above that matches your setup-difficulty comfort level — every app links to a detailed specs page and head-to-head comparisons.