The user-friendly, lightweight, and fast email client Latest Release: 3.10.1 (News), on 9 June 2014

The vCalendar plugin

The vCalendar plugin provides groupware features for Claws Mail, namely: The calendars and events are displayed in a list, in the same way that Claws Mail displays your emails.

libcurl is required, http://curl.haxx.se/libcurl/

Here are a few screenshots illustrating the features: