When Windows Mobile boots, it checks the system registry for the following key:

HKEY_CURRENT_USER\Software\Microsoft\SMS\TextShared 

This key contains a flag that specifies whether EMS processing is enabled on the device. EMS processing is disabled by default, however, you can enable this support yourself.

To enable EMS processing support:

• Register the COM component's GUID by creating the following registry key, and giving it the following name/value pair.
  HKEY_CURRENT_USER\Software\Microsoft\SMS\TextShared
      DWORD : EMSHandlerInstalled = 1

See Also

Short Message Service (SMS) API | IMessageFormEx | IFormProviderEx

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