Zimbra have recently released Zimbra Collaboration Suite 8.5 (JudasPriest).
One of the most-hyped features of 8.5 is native support for Exchange Web Services (EWS), meaning Macs and Outlook clients can natively connect to EWS instead of using the Zimbra Connector or IMAP.
After laying the groundwork for doing the upgrade – moving data around, system updates, installing the LTS Enablement pack from Canonical on Ubuntu 12.04 to upgrade the kernel among other things, we were ready for the upgrade to 8. ...