- Zimbra is based on Open Sourced software providing flexibility
- Zimbra scales significantly better and with less hardware overhead
- Multi-client support (Mac OS X & WindowsXP have parity on feature set)
- Let’s be honest, it ain’t Microsoft!
- Flexibility of server platform deployment (RHEL, MacOS X, SuSE)
- Zimlets/SOAP/REST – ability to integrate with other systems
- Searching – ever try searching a multi-gig mailbox in Outlook?
- Attachment search/rendering
- Integrated Spam/Anti-Virus that actually works well.
- Zimbra Support – try getting the response time and quality of support from MS that you can get from the Zimbra corporate team and their local partners.