DavMail 6.6 Exchange Gateway Released with Office 365 Fixes

DavMail, an open-source gateway that enables standard mail and calendar clients to work with Microsoft Exchange and Office 365, has been updated to version 6.6.

The project serves as a bridge between Microsoft’s servers and desktop email clients by offering standard protocols such as IMAP, POP, SMTP, CalDAV, CardDAV, and LDAP. This enables users to connect applications like Thunderbird instead of being limited to Outlook.

In version 6.6, key improvements include enhanced Office 365 device-code authentication and updated handling of default OIDC native clients, aligning with Microsoft’s recent changes to redirect behavior.

The release also brings several protocol-level fixes and enhancements, including:

• Improved IMAP compliance
• Fixes for CalDAV and CardDAV
• Updated SMTP handling to address duplicate message IDs
• Adoption of an XDG-compliant default location for configuration files

Linux-Specific Improvements

DavMail 6.6 introduces multiple updates tailored for Linux environments:

• Fixes for Fedora 43
• Debian packaging updates with support for JDK 21
• Initial spec file preparation for RHEL 10
• Improvements to the DavMail launcher script
• Introduction of a new davmail swt command to download the latest SWT JAR

Additionally, the system tray feature is now disabled by default on Linux, unless manually enabled via settings or command-line options.

For more details, see the announcement.