Just sharing info  Several support cases in regards with a Email client to be set to sync over GPRS or HSDPA is not synchronizing anymore due to the WIFI being unexpectably enabled.Followng resolved this:
WIFI unexpectable turned on by MS Connection Manager after HSDPA or GPRS is temporarily out of range  

SPR 16523 lacks a good explanation of the default behavior on MC75 MC55 .

The default OS behavior is the correct functionality when the device is configured to connect to an Exchange Server.

The OS will attempt to connect to the server through ALL interfaces. This includes WLAN.

So when HSDPA is out of Range it will attempt to use WLAN and power this on.

If HSDPA or GPRS is in range again it will stil try to connect through WLAN instead of GPRS afterwards.

The workaround posted for this SPR will prevent the OS from recognizing the WLAN radio as a network interface. Because of this the OS will not attempt to communicate to the server through this path.

No other options are available. Microsoft has designed the OS to work this way.

This reg key will prevent the Wi-Fi radio power on.

Installation procedure:

1. Rename the file and copy to the \Application folder of the device.

2. Tap the .reg file and merge the registry key.

3. Check Functionality of this Regmerge   Use the wireless manager power off the Wi-Fi

4. You will not be able to power on using the wireless manager .

5. Using the Fusion Tray Icon you will be able to power on the Wi-Fi radio.

REGEDIT4[HKEY_LOCAL_MACHINE\SOFTWARE\Motorola\WMHLPR\POWER_MANAGED]"HandleState1"=dword:00000000 ; Handle Poweron"HandleState0"=dword:00000001 ; Handle poweroff

http://support.symbol.com/support/search.do?cmd=displayKC&docType=kc&ex…