Obviously, features new to 1.7 (and later) will not be available as LinqPad seems to reference the 1.1 version. Also, I've been having this issue:

Assembly 'MyAssembly, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' uses 'Microsoft.WindowsAzure.StorageClient, Version=1.7.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' which has a higher version than referenced assembly 'Microsoft.WindowsAzure.StorageClient, Version=1.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'