grommunio
grommunio from Vienna is free groupware with mail, calendar and chat, meant as a replacement for Microsoft Exchange.
About grommunio
grommunio is an open groupware from Austria that grommunio GmbH in Vienna develops as a replacement for Microsoft Exchange. Email, calendar, contacts, tasks, chat, video meetings, file exchange and office tools are united in one product.
Its basis is Linux; Outlook, Android, iOS and Thunderbird work with it via IMAP, POP3, SMTP, CalDAV and CardDAV. Operation in-house or in the cloud is possible, and control of the data stays with the users. A community plan for up to five people is free; beyond that there are paid subscriptions.
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