This report provides detailed information on the reasons why buyers of IT products and services choose one vendor over another, as well as why they drop entrenched suppliers. One culprit is named as the top reason why customers reduce – or stop – business with their strategic supplier. The report also offers insight on how both incumbent vendors and those looking to penetrate a new customer can position themselves for success. Detail is provided for seven product/service categories: servers, PCs, networking products, hardcopy devices, IT professional services, communications services and outsourcing services.