Table: comparison of microsoft windows versions
Question: Which Microsoft Windows version was the last to be based on the NT 3.x kernel?
Step 1 (Operation, Indexing): based on (kernel)
Step 2 (Reasoning, Other Commonsense Reasoning): NT 3.x kernel
Step 3 (Operation, Filter): based on (kernel)
Step 4 (Reasoning, Other Commonsense Reasoning): the last
Answer: windows nt 3.51