JMAP for Calendars, Contacts and Files Now in Stalwart

Summary

After four years of development, we’re thrilled to announce a major milestone in the evolution of Stalwart — the full implementation of JMAP for Calendars, Contacts, Address Books, File Storage, and Sharing. With this release, Stalwart becomes the first JMAP server to fully support the entire family of JMAP collaboration protocols, marking a new era for open, efficient, and elegant groupware.A New Generation of Protocols​Over the past few years, the IETF has been redefining how email, calendars, and contacts are synchronized and shared. Building upon the success of JMAP for Mail, several new protocol extensions have been introduced:Together, these standards offer a cohesive and elegant ecosystem that replaces decades of fragmented WebDAV-based technologies.Limitations of Yesterday's Technology​WebDAV and its descendants — CalDAV, CardDAV, and related extensions — have served the Internet well. They are robust, widely adopted, and battle-tested. Yet, their XML-based design is notoriously verbose, inconsistent, and difficult to implement correctly. Information is scattered across HTTP headers, XML payloads, and even embedded iCalendar data, creating endless compatibility and interoperability challenges between clients and servers.Similarly, iCalendar and vCard, while expressive and versatile, have accumulated decades of technical debt. They contain countless properties and parameters—many rarely used, some obsolete, and others inconsistently implemented across versions. This clutter has made both formats unwieldy and error-prone, often requiring complex parsing logic to handle edge cases.JMAP: A Modern Solution for Modern Needs​The JMAP protocol was originally developed as a more efficient, modern replacement for IMAP and SMTP submissions. Its strengths lie in simplicity, clarity, and network efficiency — all built on top of JSON over HTTPS.Now, with the introduction of JMAP for Calendars, Contacts, Files, and Sharing, the same design philosophy extends beyond email t...