Stalwart Mail Server
Mail ServersModern all-in-one mail server in a single binary
Replaces Microsoft Exchange, Google Workspace
16 self-hosted Microsoft Exchange alternatives
Microsoft Exchange is the dominant enterprise email and calendar server, both on-prem and hosted. These open-source apps let you replace Microsoft Exchange with software you host and control yourself.
Best self-hosted Microsoft Exchange alternatives
mailcow
Mail ServersDockerized full-stack mail server suite
Replaces Microsoft Exchange, Google Workspace
SOGo
GroupwareScalable groupware server with webmail, calendar and contacts
Replaces Microsoft Exchange, Microsoft 365
WildDuck
Mail ServersScalable IMAP and POP3 mail server with REST API
Replaces Microsoft Exchange, Gmail
iRedMail
Mail ServersFree, full-featured mail server solution
Replaces Microsoft Exchange, Google Workspace
Dovecot
Mail ServersSecure, high-performance IMAP and POP3 server
Replaces Microsoft Exchange
Apache James
Mail ServersEnterprise mail server and SMTP/IMAP platform
Replaces Microsoft Exchange
Exim
Mail ServersFlexible and widely deployed mail transfer agent
Replaces Microsoft Exchange
Cyrus IMAP
Mail ServersScalable IMAP and POP server for large deployments
Replaces Microsoft Exchange
Postfix
Mail ServersFast, secure and reliable mail transfer agent
Replaces Microsoft Exchange
Horde Groupware
GroupwarePHP groupware suite with webmail and calendaring
Replaces Microsoft Exchange
DAViCal
GroupwareServer for sharing calendars and address books via DAV
Replaces Google Calendar, Microsoft Exchange
Kolab Groupware
GroupwareOpen-source groupware server with mail and calendaring
Replaces Microsoft Exchange, Zimbra
Citadel
GroupwareAll-in-one groupware, mail and collaboration server
Replaces Microsoft Exchange, Microsoft 365
Kopano Groupware Core
GroupwareOpen-source collaboration platform with Outlook support
Replaces Microsoft Exchange
Courier Mail Server
Mail ServersIntegrated mail server with IMAP, POP, and webmail
Replaces Microsoft Exchange
No apps match these filters.
Compare Microsoft Exchange alternatives
- Apache James vs Courier Mail Server
- Apache James vs Cyrus IMAP
- Apache James vs Dovecot
- Apache James vs iRedMail
- Apache James vs Postfix
- Apache James vs Stalwart Mail Server
- Apache James vs Exim
- Apache James vs Citadel
- Apache James vs DAViCal
- Apache James vs Kopano Groupware Core
- Apache James vs mailcow
- Apache James vs SOGo
- Apache James vs Horde Groupware
- Apache James vs Kolab Groupware
- Apache James vs WildDuck
- Courier Mail Server vs Cyrus IMAP
- Courier Mail Server vs Dovecot
- Courier Mail Server vs iRedMail
- Courier Mail Server vs Postfix
- Courier Mail Server vs Stalwart Mail Server
- Courier Mail Server vs Exim
- Courier Mail Server vs Citadel
- Courier Mail Server vs DAViCal
- Courier Mail Server vs Kopano Groupware Core
- Courier Mail Server vs mailcow
- Courier Mail Server vs SOGo
- Courier Mail Server vs Horde Groupware
- Courier Mail Server vs Kolab Groupware
- Courier Mail Server vs WildDuck
- Cyrus IMAP vs Dovecot
- Cyrus IMAP vs iRedMail
- Cyrus IMAP vs Postfix
- Cyrus IMAP vs Stalwart Mail Server
- Cyrus IMAP vs Exim
- Cyrus IMAP vs Citadel
- Cyrus IMAP vs DAViCal
- Cyrus IMAP vs Kopano Groupware Core
- Cyrus IMAP vs mailcow
- Cyrus IMAP vs SOGo
- Cyrus IMAP vs Horde Groupware
Switching from Microsoft Exchange
Moving off Microsoft Exchange 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.