To understand the economic impact of generative AI, this paper analyzed 200,000 anonymized conversation data between users and Microsoft Bing Copilot. The analysis found that the most common tasks for which people request AI assistance are information gathering and writing, while the most common tasks performed by AI are providing information and assistance, writing, training, and consulting. Combining these activity classifications with measures of task success and impact scope, we calculated an AI applicability score for each occupation. The results revealed that knowledge-worker occupations, such as computer and math-related occupations, clerical and administrative support occupations, and sales occupations involving information provision and communication, had the highest AI applicability scores. Furthermore, we present a comparison of the types of most successful tasks, the correlation between wages and education levels and AI applicability, and a comparison between actual usage and predicted AI impact across occupations.