具有开源许可证的Android Tablet版Netrepid Hosted Exchange Services的替代方案

• Android Tablet
  所有平台 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
• 开源许可证
  任何牌照 免费许可证 开源许可证 商业牌照