Microcapsules are small particles which contain an active agent or core material surrounded by a coating or shell. The utility of microcapsules for efficient cargo storage and targeted release is of considerable importance in self-healing materials, nutrient preservation, agricultural applications, fragrance release, and drug delivery. One of the most challenging tasks and the ultimate purpose of developing delivery systems are to modulate the release of encapsulated cargo substances. Strategies such as heat treatment, pH change, magnetic fields and light-induced morphology change have been used to alter the shell density and integrity, and then to influence capsule permeability. During the lecture drawbacks and challenges in perfume encapsulation technologies and product stability will be discussed.