davmail
DavMail translates Exchange and Office 365 proprietary protocols into standard POP/IMAP/SMTP/CalDAV/CardDAV/LDAP, enabling any mail client to work with Microsoft servers. It runs on all platforms, works via OWA, and is not affected by Log4j vulnerabilities.
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A lightweight gateway to use any email client with Exchange/Office 365, no Outlook required.
Core Features
- Converts Exchange/Office 365 to standard protocols (POP3, IMAP, SMTP, CalDAV, CardDAV, LDAP)
- Works on Windows, macOS, Linux, including remote OWA access
- No Outlook needed – use Thunderbird, Apple Mail, Evolution, etc.
- Lightweight single-process gateway, easy to configure
- Not vulnerable to Log4j CVE-2021-44228, high code quality
What It Can't Do
- •Requires Java 8+ (Windows standalone includes embedded JRE, others may need to install Java separately),Initial setup may need IT help to get correct Exchange URL and authentication method (basic auth or OAuth2),Does not support advanced Exchange features like unified messaging, public folders, or Outlook rules,If multi-factor authentication (MFA) is enabled, you may need OAuth2 or an app password,DavMail binds to several local ports (default 1025, 1110, 1143, 1080); ensure no other services use them
Use Cases
- Replace Outlook with any email client while keeping corporate Exchange/Office 365
- Remote workers accessing Exchange via OWA without browser dependence
- Linux/macOS users needing Exchange calendar and contacts
- Migrating from Outlook to open-source clients with minimal disruption
Detailed Introduction
DavMail is an open-source gateway that translates Microsoft Exchange and Office 365's proprietary protocols into standard email, calendar, contacts, and directory protocols (POP, IMAP, SMTP, CalDAV, CardDAV, LDAP). It runs on macOS, Linux, and Windows, and can work over Outlook Web Access (OWA), making it ideal for environments without Outlook or for users who prefer open-source or third-party clients. The project is mature (over 15 years) and actively maintained, with builds available via SourceForge, Docker, Flatpak, and RPM. It is not affected by Log4j vulnerabilities. Key strengths: no dependency on Outlook, works remotely via OWA, and lightweight compared to alternatives like OpenChange or Evolution MAPI.
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Getting Started
Download installer
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Install the software
Double-click the downloaded installer and follow the prompts
Download the installer for your OS from SourceForge or GitHub Releases
Install and launch DavMail (look for system tray icon)
Open configuration GUI, enter your Exchange server URL (e.g., https://mail.company.com/ews) and credentials
- Download the installer for your OS from SourceForge or GitHub Releases
- Install and launch DavMail (look for system tray icon)
- Open configuration GUI, enter your Exchange server URL (e.g., https://mail.company.com/ews) and credentials
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Open Source Transparency
View GitHub SourceUninstall Info
Windows: use Control Panel 'Add or Remove Programs'. macOS: delete .app from Applications and remove ~/Library/DavMail config folder. Linux: use package manager (e.g., sudo apt remove davmail) or delete extracted folder. Backup any custom settings.
No Extra Dependencies
Ready to use after download. No additional runtime required.
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