Joined Cases C-4/18 and C-5/18: Judgment of the Court (Fifth Chamber) of 16 October 2019 (requests for a preliminary ruling from the Bundesfinanzhof - Germany) – Michael Winterhoff, acting as liquidator of DIREKTexpress Holding AG v Finanzamt Ulm (C-4/18) and Jochen Eisenbeis, acting as liquidator of JUREX GmbH v Bundeszentralamt für Steuern (C-5/18) (Reference for a preliminary ruling — Taxation — Common system of value added tax (VAT) — Directive 2006/112/EC — Article 132(1)(a) — Exemptions for certain activities in the public interest — Public postal services — Directive 97/67/EC — Universal postal service provider — Private operator providing the service of formally serving court or administrative authority documents)