Mobile devices such as Windows Mobile powered phones or iPhone 3G utilize ActiveSync technologies to synchronize device email and calendar items with the corporate email and collaboration systems. ActiveSync allows to deliver new messages with a "push" model, where new emails will reach mobile device with minimal delay, when they reach the main email system.
Z-Push software allows to implement "push" functionality using open source technologies. Z-Push technology was developed and it is integrated in Zarafa messaging software.
Z-Push can be used with email services, that support IMAP, for example Gmail, however using this tool with external email providers to speed-up delivery of messages to mobile devices may not be successful, since external providers will still have to be polled with specific intervals to get latest email. However, if the company hosts own internal email system, Z-Push may greately improve email delivery to mobile devices.

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