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I am developing a Windows 8 tile app/Metro (Windows RT) application. I have experienced some problems linking with the C# client object model assemblies due to limitations in RT.

I was hoping I might use the JavaScript OM, but that does not appear to work either.

Is the best approach to use REST without any helping libraries? I have found authentication to be a challenge here.

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up vote 3 down vote accepted

Your best route here is going to be to use web services from SharePoint in your Windows Store app.

You can do it in JavaScript apps:

Or in .NET apps:

As for credentials, your user will need to enter them into your application so that you can use them when making the web requests. You can use the credential vault thing that Windows has:

This article has a list of available web services for SharePoint Online:

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