removed from PCL for the sake of wide platform support Lazy, Tuple are not supported on SL4/WP7.5. Should platform set be reduced just because of Lazy[ness]? C# dynamic is cool, but lack of dynamic support should not discard the whole platform, there should be a fallback to an alternative API await/async and TPL are cool too but also limit your platforms a) var result = client.FindEntry("Products", x.ProductName == "Chai") b) var result = client.FindEntry("Products?$filter=ProductName eq 'Chai'")