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The service health page exists to display if and when there has been any downtime of any of the Office 365 services; to make Microsoft accountable for your business productivity. It displays up until the end of the past week.
The upcoming maintenance allows administrators to troubleshoot future problems in service disruption. It's also 'polite' for Microsoft to inform users, who rely on the cloud service entirely for business productivity, to inform customers of when their business may suffer.