This Unity tutorial will show you how to make your Unity 4.6+ UI scale to match any resolution and aspect ratio with the Canvas Scaler component. See here for how to do it with Anchors: https://www.youtube.com/watch?v=svyDgYz5idg
And here for how to do this for the old GUIText: https://www.youtube.com/watch?v=_9mOh7_xX2o
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