Alternativ till Netrepid Hosted Exchange Services för Mac med öppen källkodslicens

• Mac
  Alla plattformar Windows Mac Linux Android iPhone iPad Android Tablet Web Self-Hosted Software as a Service (SaaS) BSD Microsoft Office Outlook Thunderbird VMware vSphere Hypervisor Cloudron OpenPGP VirtualBox
• Open Source-licens
  Eventuell licens Gratis licens Open Source-licens Kommersiell licens