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See also Using Zimbra with Apple iOS Devices (IMAP)
The Zimbra Network Editions include EAS or Exchange Active Sync support. Use IMAP if you don't have EAS support on your Zimbra server.
The Zextras add-on package also adds EAS support to the Zimbra Open Source Edition.
Our public Zimbra server has mobile support using the Exchange ActiveSync protocol (EAS) with 'push' notifications.
EAS will sync:
All modern iOS devices support 'Exchange' or 'EAS' accounts without installing any apps.
https://support.apple.com/en-us/HT201320
This was done using iOS 8.1.3
On your iOS device, add a new Exchange/EAS/Corporate account for the new server.
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