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The Zimbra Network Editions include EAS or Exchange Active Sync support.
The Zextras add-on package also adds EAS support to the Zimbra Open Source Edition.
Our public Zimbra server has mobile support using the EAS or Exchange ActiveSync protocol 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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