Just pointing out that sharing with Windows Phone 7.1(5) is now easier with the Microsoft SharePoint SDK for Windows Phone 7.1

Microsoft Downloads - Microsoft SharePoint SDK for Windows Phone 7.1

This SDK installs SharePoint client libraries and templates for Windows Phone 7.1

Version: 1
Date published: 8/13/2012

Language: English

spdxmobile.msi, 1.0 MB
spdxmobile_x64.msi, 1.0 MB

Overview

The SDK installs Windows Phone CSOM libraries for Windows Phone, SharePoint Auth library for Windows Phone and Windows Phone Project Templates, which can be used to build Windows Phone 7.1 Applications against SharePoint 2013 or SharePoint 2010

System requirements

Supported operating systems: Windows 7, Windows 8, Windows Server 2008 R2

Windows Phone 7.1 Developer Tools are required.

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Merge with with the Corporate Store/Portal coming with Windows Phone 8 and I think you've really got something (assuming app's built with this works with WP8... :| )

 

Related Past Post XRef:
Want to SharePoint from your WP7 App? Check out the SharePoint 2010 Windows Phone 7 Toolkit
“SharePoint 2010 and Windows Phone 7 Training Kit” (Think “Building Windows Phone 7 Apps that integrate with SharePoint Training Kit”)