We have an on premise SharePoint 2010 farm, and a SharePoint Online 2013 farm. We would like to be able to have a solution running on the on premise farm that will talk to the online farm.
Since the 2010 solution would have to use .NET 3.5, is it even possible to have this solution load Microsoft.SharePoint.Client and use it to authenticate and connect to SharePoint Online? Or will I have to have something outside of SharePoint 2010 running to connect to SharePoint Online, and then serve data to the SharePoint 2010 solution?
This is my reference for connecting to SharePoint 2013 Online: http://code.msdn.microsoft.com/office/SharePoint-2013-Hello-0fd15fbf/sourcecode?fileId=77290&pathId=933217996