Judgment of the Court (Sixth Chamber) 5 February 2002 in Case C-277/99 (Reference for a preliminary ruling from the Verwaltungsgerichtshof): Doris Kaske v Landesgeschäftsstelle des Arbeitsmarktservice Wien (Social security for migrant workers — Unemployment insurance — Replacing social security conventions concluded between Member States with Regulation (EEC) No 1408/71 — Preservation of advantages enjoyed previously as a result of a combination of domestic law and the law of the relevant convention — Free movement of workers)