Is a customer's past purchase experience of traditional banking products applicable to the continuing purchase of insurance and investment products at a bank branch? Are service attributes used with similar extensions evaluated differently from when used with dissimilar extensions? In response to these questions, this study develops and examines a framework of service attributes (e.g., locational and one-stop shopping convenience, functional and technical service quality, and firm reputation and size) having positive effects on cross-buying. Meanwhile, this study also examines the mediating roles of satisfaction and trust on the relationship between services attributes and cross-buying. Our results indicate that the relative importance of locational convenience and functional service quality is likely to decline, while the relative importance of one-stop shopping convenience and firm size is likely to increase as category dissimilarity increases. Technical service quality and firm reputation only have indirect effects on cross-buying dissimilar product categories through trust. Instead, satisfaction plays the mediating role for cross-buying similar product categories. Our findings reinforce the view that the relative effects of service attributes, satisfaction and trust on cross-buying vary under different category similarity conditions.