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Microsoft makes Outlook.com a progressive web app (and PWAs will eventually act like native Windows apps) - Liliputing
Progressive web apps are basically websites designed to act more like desktop programs than websites. They can be used when you’re offline, deliver push notifications when you’re online, and access your computer’s hardware, among other things. And since progressive web apps, or PWAs, work with just about any standards-compliant web browser, you can visit a …