A vector bundle over a complex manifold is said to be holomorphic if its trivialization maps are biholomorphic maps. What is a "natural" example example of a vector bundle over compact complex manifold which is not holomorphic? I guess by "natural" I mean that one would be interested in such examples for reasons besides them being a counter example.
TO CLARIFY: I am interested in
i) COMPLEX VECTOR BUNDLES
ii) NOT ADMITTING ANY HOLOMORPHIC STRUCTURE