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Microsoft just changed where your Word documents live — here’s why it matters
(www.windowscentral.com)
This is a most excellent place for technology news and articles.
As a us organization you can choose between different MS cloud tiers. I know about 3, the basic tier for private customers, tier4 for large corporations and tier 5 for us gov and military organizations. My guess would be that it has something to do with which 3 letter agency can access your cloud data.