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|Push (DMU) seems to work only sometimes with Windows Mobile 5
|Push (DMU) requires an active TCP connection to the push server.
GPRS based connections remain active even when the device goes into power save mode (black screen) or when it is switched off.
Many Windows Mobile 5 devices now feature UMTS and WLAN. Unfortunately, those connections are dropped when the device goes into power save mode or is switched off, therefore push is deactivated until the device powers up again. It seems that UMTS and WLAN consume too much power to be kept active in power save mode.