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Windows Explorer is an end user, a consumer product. It creates a reality distortion field that hides part of what is really there and makes you see things that do not exist. That is OK for its intended customer base, but as an administrator you cannot afford to live in a dream world.

When it comes to copying files, Windows Explorer may probably be called reliable, but fast it is not. After the rewrite of the copy routines in Vista had caused much customer dissatisfaction, Microsoft rewrote the copy dialog again for Windows 7. But still, especially copying many small files takes ages.