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http://blogs.msdn.com/b/crm/archive/2010/05/13/microsoft-dynamics-crm-sdk-4-0-12-and-the-advanced-developer-extensions.aspx
"It should be emphasised that the LINQ query ultimately maps down to a QueryExpression, and hence you are as limited in the scope of queries as you currently are."
As QueryExpressions don't support everything that FetchXML does the MS code (haven't tried) could be more limited in features.
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