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    1. COThat's basically what I led with. You just added the bit about another app updating the cache, but that's besides the point as *my* background task still only accesses cached data. And actually you can use the heavy background task which can run as frequently as once every ten minutes. But again, that still doesn't answer the question if it can be done or not. It of course can as Nokia has a nav app and they aren't first-party (ala wide live tiles) but then again, maybe they have exclusive access the rest of us don't thanks to their MS partnership which would be a pity.
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    2. COI presume by "heavy background task" you mean `ResourceIntensiveTask`? If so I'm not seeing anywhere that they can run every 10 minutes but instead that they can run for **up to** 10 minutes. However given the other restrictions placed on them (Must have power, WiFi, > 90% battery, screen lock. Ref: http://msdn.microsoft.com/en-us/library/hh202942(v=vs.92).aspx) I doubt it's useful to you. Long story short: What you're directly asking does not seem possible with the standard SDK. You might need to look into interop (Ref: http://forum.xda-developers.com/showthread.php?t=1299134) but...
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    3. COUsing interop requires a device to be interop unlocked. There is rumour that some market place ingested applications are being found with native and interop code (Ref: http://pocketnow.com/windows-phone/microsoft-starts-allowing-native-arm-code-in-wp7-apps) but as to if your application would be allowed into the market place with such code? You're taking a gamble. It sounds like something that might require technical exemption when being certified. Details on certification / exemption: http://msdn.microsoft.com/en-us/library/hh202928(v=vs.92).aspx
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