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  1.    #1  
    Is it necessary to keep every app purchase receipt that HP emailed me?

    Can I just delete those emails after writing down the invoice number,
    purchase date, and the name of the app?

  2. #2  
    its only worthwhile if you have an issue and need to prove that you bought it. Other than that, no.
  3. #3  
    Look at it no different than any other receipt you might get purchasing from a brick / mortar store.
  4. #4  
    If you have the invoice number, date and control of the WebOS account that you used to buy it then you shouldn't need anything else. I'd find it more annoying to keep track of a piece of paper than the tiny email receipt which I can search for though.

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