Using the Office 365 API, we\'d like to allow users to view meeting rooms calendars and reserve them for events according to their permissions within Office 365.
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The Graph API doesn't solve this problem, unfortunately. It has the same authentication limitations as the Outlook APIs. The good news is we are working on changes to enable this scenario, though I don't have any firm timeline.
Version 1.0 of Graph should be stable for production. It is not considered a "preview" or "beta", so you should be fine to use it.