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Actually, Outlook.com DOES have IMAP accessibility, sort of. It is actually MAPI just like Exchange, but it does require a special connector for Outlook. Windows phone of course has it native. Not sure on the other platforms if there is an app for it, but M$ has been quite agnostic in past years, and I would anticipate one.

An important add on to me at least is not only the Skydrive storage, but integration. You can truly go agnostic and still access whatever you want. Links to multiple PC's, mbile devices via skydrive app, and web access means wherever you store you files, you can still access them from any other device.