Joined Cases C-287/06 to C-292/06: Judgment of the Court (First Chamber) of 6 March 2008 (reference for a preliminary ruling from the Verwaltungsgericht Köln, Germany) — Deutsche Post AG (C-287/06, C-288/06 and C-291/06), Magdeburger Dienstleistungs- und Verwaltungs GmbH (MDG) (C-289/06), Marketing Service Magdeburg GmbH (C-290/06), Vedat Deniz (C-292/06) v Bundesrepublik Deutschland (Postal services — Directive 97/67/EC — Field reserved to universal postal service provider — Special tariffs for the deposit by business customers, at fixed points of the postal network, of minimum quantities of pre-sorted items — Refusal of such tariffs to intermediaries who consolidate, on a commercial basis and in their own name, postal items from various senders)