I hate not having native QR support, integrated in bing vision.
I don't need to scan a QR code or a Bar Code often, but when I do, I need it FAST.
It used to take two taps: magnifying glass, eye.
Then it took a few more
Now it takes a 3rd party app.
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And then I liked the integration, grouping into hubs.
Photo hub showed photos from many sources.
People hub showed most things you could do with a person, and their facebook/linkedin posts
(I was waiting for an open apo, so other social networks could plugin. Never happened.)
MSN/Facebook/SMS were shown in ONE dialog timeline.
(I was waiting for an open api so WhatsApp could plugin. Never happened.)
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I liked that you never had to tap in the upper left corner. Apps used the caroussel interface, allowing you to swipe through the screens. I liked the spatial map this created in my head: it made apps so much simpler. I liked the original spotify app. (I believe I was one of the few)
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So what I liked about Windows Phone 7, is that the let go of existing things and re-though usability. This made me use my first smart phone.
I hated most Android flavours, and I didn't like iOS very much either. (I've tried iOS for the past few months and it's actually not that bad. It took some good things from Windows Phone, while Windows seemed to take all the bad things from Android and iOS.
Still. If Continuum works, I'll still be glad to use it.