.net - Why Microsoft does not use Entity Framework on their products? -

i wondering why microsoft doesn't use entity framework on products service bus, workflow manager, , biztalk , on?

since pushing.net communities use it, why don't start initiative , show best practice on how can, .net stack developer, implement enterprise project using ef best practice?

is related performance issue people talk since release of ef?

ef has come long way since versions of orm. have used in large projects , haven't had significant performance issues. said, products have mentioned have been there before ef came existence may have form of orm have been build , maintained internally. if looking pattern , practices please checkout articles written julie lerman.