So I looked at unity editor usage (from analytics). Thought that might be useful in deciding which unity versions to support in your AS packages. Here's data from last month (2015 Nov 19 - Dec 19), excluding sessions from beta versions. OS share is 84.3% Windows, 15.7% Mac.
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Older data from 2015 October:
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Older data from 2015 July:
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Older data from 2015 March:
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Older data from 2015 October:
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Older data from 2015 July:
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Older data from 2015 March:
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