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The main issue is that the Windows CE Operating System is not included on the supported OS (Operating System) lists. This means that even though you can install the SlingPlayer application, it might not work properly.
The following links will provide you with information about the supported OS for the Slingbox and Windows Mobile application.
Tech Specs for the Slingbox PRO HD:
Devices and requirements for Windows Phone non-touch screen:
Devices and requirements for Windows Phone touch screen:
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