The article explores how technological cooperation influences innovation. The focus is on cooperation with suppliers, particularly providers of knowledge-intensive services (KIS). The authors highlight the importance of innovation policy tools that stimulate the development of such services. The article examines technological cooperation between KIS providers and customers and evaluates its impact on the probability of successful innovation in Poland’s manufacturing sector. The authors apply a two-step econometric procedure known as a hurdle regression model, using data from the Polish version of the 2008 Community Innovation Survey (CIS). The authors conclude that technological cooperation with suppliers has a significant statistical impact on innovation, thereby increasing the probability of successful innovation and the role of innovative sales in total turnover. This effect is greater in sectors that use KIS more intensively, which means those in which spending on KIS makes up a predominant part of business costs, Majewska and Truskolaski say. Among the main findings of the article is that innovation policy should focus on stimulating the use of KIS by firms and public organizations (through the promotion of cooperation). Such an approach leads to increased competitiveness at the microeconomic and regional levels, the authors conclude.