In this paper we aim to empirically test the relative influence of internal and external conditions for the adoption of Enterprise Information Systems (EIS). For this goal data are used from the EU-initiated E-Business W@tch survey 2002/2003 among more than 10,000 organizations from seven different European countries. It appears that organizational size, sector and country all have significant and cumulative effects on the EIS adoption by organizations. More specifically, national culture matters if we control for size and sector.