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We study moduli stabilization for type IIB orientifold compactifications on Calabi‐Yau three‐folds with (non‐)geometric fluxes. For this setting it is possible to stabilize all closed‐string moduli classically without the need for non‐perturbative contributions, and examples of stable de‐Sitter constructions can be found in the literature which violate a prominent swampland conjecture. In this paper we derive general properties of non‐geometric flux‐compactifications, we argue that the contribution of fluxes to the tadpole cancellation conditions should be similar to D‐branes (and not anti‐D‐branes), and we exclude supersymmetric Minkowski vacua for certain cases. We also reassess known stable de‐Sitter constructions with (non‐)geometric H‐, F‐, Q‐ and R‐fluxes and argue that these are not consistent in string theory. The moduli stabilization for type IIB orientifold compactifications on Calabi‐Yau three‐folds with (non‐)geometric fluxes will be studied. For this setting it is possible to stabilize all closed‐string moduli classically without the need for non‐perturbative contributions, and examples of stable de‐Sitter constructions can be found in the literature which violate a prominent swampland conjecture. In this paper general properties of non‐geometric flux‐compactifications will be derived and argued that the contribution of fluxes to the tadpole cancellation conditions should be similar to D‐branes (and not anti‐D‐branes). Supersymmetric Minkowski vacua are excluded for certain cases. Known known stable de‐Sitter constructions with (non‐)geometric H‐, F‐, Q‐ and R‐fluxes are reassessed and argued that these are not consistent in string theory. [ABSTRACT FROM AUTHOR]