What/where is MimerDesk ?

MimerDesk is a Web-based groupware environment designed for a wide variety of uses such as personal management, computer-supported collaborative learning, carrying out projects, and setting up communities.

How about these features (kind of like Facebook):
        o read messages online if they prefer not getting Email
        o post messages to the group from the web Email tool
        o personal TODO list, calendar, address book, files, friends
        o group email, files, links, address book, reviews, calendar, news,
          voting, projects, and forums (chat is not working for now)
        o Easy visibility of all group members, with only the details YOU want
          to share with others visible.

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