ThinkPad products can belong to any of the following series except which one?

The ThinkPad product line is known for its professional and business-oriented devices, each built to cater to specific user needs. The X series focuses on ultra-portability, ideal for users who prioritize mobility without sacrificing performance. The T series is designed to be thin and lightweight while still offering robust features for business professionals. The E series targets small to medium-sized businesses, providing a balance of performance and affordability.

The M series, however, is not a recognized series within the current ThinkPad lineup. Historically, it may have been referenced for multimedia purposes, but it has not been a standard series in the ThinkPad range that is widely offered today. Therefore, it is not applicable for ThinkPad products currently categorized among the series mentioned. This clarification on the series aids in understanding the fundamental organization of Lenovo’s ThinkPad branding and product categorization.