The first sneak peek video that Microsoft shared of Windows 8, the next major iteration of the Windows client, has been watched almost 5 million times.
4,979,559 times to me more specific, according to the official count on YouTube at the time of this article.
Microsoft made the Building "Windows 8" - Video #1 available at the start of June 2011, on the same day it offered the first official preview of Windows 7’s successor to the world.
Windows 8 NUI GUI Video Almost at 5 Million Views - Softpedia