The Exchange Product team has written an article that explains steps that an administrator can take to help isolate direct push technology issues. For more information about the deployment of direct push technology, see the Exchange Server blog article "Direct push is just a heartbeat away" at http://go.microsoft.com/fwlink/?LinkId=67080.
1. Does direct push technology work for folders other than inbox?
Yes, direct push is available for mail folders, Contacts, Calendar and Tasks. The list of folders for direct push is the same as the list of folders that have been configured for sync.
2. What devices support direct push technology?
Windows Mobile 5 devices require the Messaging and Security Feature Pack(MSFP) for direct push. MSFP is included with AKU2.2. So any Windows Mobile 5 device that has AKU2.2 supports direct push. The AirSync protocol has been licensed to several companies such as Palm, Motorola, Nokia, Symbian, Dataviz and SonyEricsson. Please contact the licensees to see if direct push capable devices are available.
3. Is direct push supported over Wi-Fi?
No. direct push requires a cellular data connection. It is not supported over Wi-Fi or Desktop Passthrough (when the device is cradled).
Due to hardware limitations, Wi-Fi cannot go into standby mode and receive notifications. So in order to support direct push over Wi-Fi, the Wi-Fi connection would have to be kept alive which in turn would drain the battery very rapidly.
4. Does direct push technology work with SecurID?
RSA has an update to their agent to allow it to work with direct push technology. RSA Authentication Agent 5.3 for Web for IIS enables you to use Exchange ActiveSync without having to reauthenticate every time ActiveSync is invoked. For more details, please read this and contact RSA.
5. Does direct push have an impact on server performance?
A typical FE services several thousand connections from clients using OWA, OMA, EAS, and RPC/HTTP clients. Based on the testing done by Microsoft IT, the additional connections opened by direct push did not require the deployment of any additional FE or BE servers. It also did not require an upgrade of hardware on existing servers.
For more information please refer to the whitepaper titled "Microsoft IT Scalability Experience with Windows Mobile 2003 and Exchange Server 2003 Mobile Messaging" available at
http://www.microsoft.com/windowsmobile/business/strategy/scalability.mspx
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