This is an update to my original post “How to Check Your Skydrive Pro Usage“, as it’s no longer valid.
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Go to your OneDrive

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Click on the Site Settings (Cog) icon

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Select “Site Settings”

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Under “Site Collection Administration” choose “Storage Metrics”

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Finally, in the upper right, you’ll see the value of your OneDrive for Business storage limit.

Many thanks to my colleague Stephanie Kahlam for having figured this one out this time around.