Paderborn, Germany, 2014-10-23— /EPR Retail News/ — Wincor Nixdorf Portavis's contract as IT outsourcing partner of Sparkasse Bremen is to be renewed for a further five years starting October 1, 2015. The contract has been in place since 2005 and was already renewed in 2011 for a minimum period of four years. Under the contract, Portavis…