Zimbra, Google and Microsoft Comparison
| Email Softwares |  |
 |
 |
 |
| Deployment and Scalability | ||||
| File Management Suite Required | ||||
| Full H/A | ||||
| User Policy Management | ||||
| Open Non-Proprietary Architecture | ||||
| On Premise Option | ||||
| Cloud Ready | ||||
| Modern Platform | ||||
| Security Confidence | ||||
| Overall User Experience | ||||
| RSS Feeds | ||||
| Group Calendars | Limited | Limited | ||
| Email Sorting | ||||
| Tasks | Limited | Limited | ||
| Windows | Limited | |||
| Mac | Limited | Limited | ||
| Desktop-Like Experience | ||||
| Offline | Limited | |||
| Cross-Platform Sync | Limited | |||
| Advanced Search | Limited | |||
| Full Web Service API | Limited | Limited | Limited | |
| Plugins (e.g. Salesforce.com) | Limited | Limited | Limited |