1)   GroupWare 1.0.6
MDaemon GroupWare unlocks the collaborative functions of Microsoft Outlook using MDaemon as the mail server platform. Outlook users can share Calendar, Tasks, Contacts, Notes, and Journal folders without the expense or expertise required by Exchange.
share folders, share contacts, share calendar, share tasks, Groupware, E-mail, Email Server, Server, POP3, IMAP,

 2)   GroupOutlook 1.0.1966.32251
GroupOutlook from Amarillo Software allows you to easily and affordably share Outlook calendars, contacts, e-mail, tasks, journals and notes without Exchange Server.
Outlook Add-In, Exchange Alternative, Share e-mail, Share calendar.,