Now it needs to tackle the hard part of its strategy: making it all work together seamlessly, for instance by offering a single sign-on for all its services and one-touch access.

ECONOMIST: Nokia

If you want to live in a Google or Microsoft world, with a single sign-on to those companies' services and all of their apps, an Apple device won't cut it.

WSJ: How Apple Gets All the Good Apps

Through the single sign-on and careful attention to the interface, all the services have a consistent look and feel, he said.

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