GroupDAV
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GroupDAV is a computer protocol used to connect Open Source groupware clients with Open Source groupware servers. It is a lightweight protocol whose primary design goal is to be as simple as possible to implement, focusing more on real world issues with open source applications than on an extremely extensive command set. It is based on a subset of WebDAV.
Client side GroupDAV implementations exist for KDE Kontact, Novell Evolution, Thunderbird and Outlook, work on the Mozilla Calendar Project is in progress. Servers include OpenGroupware.org, SOGo, the Citadel system and eGroupWare. In addition every WebDAV (and therefore CalDAV/CardDAV) server is implicitly a GroupDAV v2 server[citation needed].
GroupDAV's relationship to CalDAV varies from developer to developer. Some of the earliest implementors intended it as a protocol complementary to the CalDAV effort, because CalDAV provides more extensive operations on calendar folders. Others have positioned GroupDAV as the leading protocol, citing CalDAV's excessive complexity as a source of interoperability bugs. This dichotomy is likely to become irrelevant in the future, however, as it is straightforward for a server to simultaneously support both protocols.
GroupDAV isn't developed any further. Its superseded by CalDAV (RFC 4791) and CardDAV.
