def master_categories(self) -> MasterCategoriesRequestBuilder:
        """
        Provides operations to manage the masterCategories property of the microsoft.graph.outlookUser entity.
        """
        from .master_categories.master_categories_request_builder import MasterCategoriesRequestBuilder

        return MasterCategoriesRequestBuilder(self.request_adapter, self.path_parameters)

        Provides operations to manage the masterCategories property of the microsoft.graph.outlookUser entity.
        
msgraph/generated/users/item/outlook/outlook_request_builder.py