Add ActiveSync support to Horde for allowing Horde to sync with mobile devices using the mobile device's support for Microsoft Exchange/ActiveSync. Use Z-Push library (http://z-push.sourceforge.net) for handling ActiveSync protocol communication.
Integrate the Z-Push library into Horde. Provide the ability for Horde to provide over the air synchronization of email, contacts, and calendar data to devices such as the iPhone/iPod Touch, Android and any other system supporting ActiveSync.
Need to implement ghosted properties / SUPPORTED tag. Currently, all data on the server is overwritten and replaced with only what the PIM sends. It's possible for some PIMS to ghost contact and calendar properties so that only the supplied tags are changed, and missing, ghosted properties are retained on the server. When a PIM supports this, it sends a SUPPORTED tag with children representing the NON-ghosted properties. The absence of the SUPPORTED tag would indicate that any property not transmitted should be handled as a ghosted property.
Configurable heartbeat interval range: The protocol allows for rejecting heartbeat intervals that fall outside a specific range, and send back a suggested heartbeat interval to the client. This should be implemented as a configuration value.
Some discussion/issues/info on calendar sycing
Some work towards a Horde adapter for Z-Push:
Some discussion on remote wipe issues with various devices
Web-based client test
Another AS implementation in PHP, though we can't use it due to the license, there is some good information there for the taking.
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