What is the fine-grained topic of the following text: With Oracle starting the official sunsetting of their User Productivity Kit (UPK) product by removing development and support efforts in the coming years, many existing UPK customers are facing challenges around compatibility with newer server and operating systems that are not supported by UPK. Only return the topic.
Challenges faced by existing UPK customers due to Oracle's discontinuation of support and compatibility with newer systems.