The iPhone 4 is giving Apple a PR nightmare as a result of the iPhone 4 signal problems but is it really as bad as the scorn poured on Windows Vista? One of Microsoft’s top execs seems to think so. At the firm’s Worldwide Partner Conference, Kevin Turner, Microsoft’s COO compared the issues around the new iPhone with the problems that plagued Vista. Is he right? And why is Microsoft still using its own products as a punchline?