none

Accretion onto white dwarfs is a moderately efficient energy sourceand results in a variety of interesting behavior of cataclysmic variables (CVs, whose mass donors are Roche-lobe stars on or nearthe main sequence) and symbiotic stars (red giants). In addition,accretion alone would lead to the secular growth of the white dwarfmass, which is counteracted by the large mass loss during novaoutbursts (thermonuclear runaways when a sufficient amount of hydrogenrich matter is accumulated). The initial white dwarf mass distributionof CVs and symbiotic stars, the secular changes of the mass, and theultimate fate of these binaries are all interesting questions.I will present a selection of recent results on CVs and symbioticstars from X-ray and multiwavelength observations that touch onthe question of mass. Specific topics include X-ray surveys,X-ray spectra as white dwarf mass indicator, and the quest to measure the ejecta mass in a variety of novae.