["Journal of Management Studies, Volume 63, Issue 6, Page 3063-3096, September 2026. ", "\nAbstract\nMost prior research has assumed that employees always appreciate coworker support. However, coworker support exceeding expectations can be considered a double‐edged sword in the workplace. Drawing on expectation violation theory, this research explores when and how coworker support exceeding expectations becomes a positive or negative expectation violation that influences employees' interpersonal behaviour. We propose that when employees have a lower level of workplace status, coworker support exceeding their expectations is more likely to be a positive expectation violation and, therefore, will be positively related to employee gratitude and interpersonal citizenship behaviour. In contrast, when employees have a higher level of workplace status, coworker support exceeding expectations tends to be a negative expectation violation and, in turn, is positively related to employee shame and interpersonal counterproductive work behaviour. Two multiwave field surveys with Chinese employees and two scenario‐based experiments with Western workers largely support our hypotheses.\n"]