Alternativ till Bookis för Microsoft Office Outlook med öppen källkodslicens

• Microsoft Office Outlook
  Alla plattformar Windows Mac Linux Chrome OS Android iPhone Windows Phone iPad Android Tablet Web Self-Hosted Software as a Service (SaaS) PHP jQuery Windows Mobile Slack Microsoft Office Outlook Chrome Google Calendar Sunbird Google Apps Microsoft Exchange Server Apple Calendar
• Open Source-licens
  Eventuell licens Gratis licens Open Source-licens Kommersiell licens