Alternativas ao Netrepid Hosted Exchange Services para Software as a Service (SaaS) com licença gratuita

• Software as a Service (SaaS)
  Todas as plataformas 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
• Licença gratuita
  Qualquer licença Licença gratuita Licença Open Source Licença comercial