Zarafa provides support for synchronizing mail, contacts and calendars right out of the box for both iPhone/iOS and Android devices.
The Z-push technology used for synchronizing mobile devices is included on every ClearOS Zarafa install. In order to use it, please make sure access to TCP port 80 is available on Incoming Firewall page. To verify that it is working, use your web browser to test it. In your web browser, type the following web address:
You should see an authentication dialog and your username and password should allow you access to a simple web page.
The following videos provide a walkthrough for configuring iPhone/iOS and Android devices: