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That is acceptable for the smaller devs, but not Sprite. Although they do have a beta and obviously creating a backup app is tied more to the OS than say, a game that may work on WM5 without changes.
Your questions asks about the "leading companies". They are not a leading company if they do not keep up with the latest OS. The one man shops get some slack, since they may have to buy a new device just to test!
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