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Video 1:

source: http://www.nbc.com/The_Office/video/clips/the-office-celebrates-100/1087335/

Video 2:

source: http://www.nbc.com/The_Office/video/clips/on-the-set-of-the-100th-episode/1100234/

What's Your Favorite Moment?:

source: http://www.nbc.com/The_Office/video/clips/whats-your-favorite-moment/1094162/

Favorite Michael Moments:

source: http://www.nbc.com/The_Office/video/clips/favorite-michael-moments/1103528/

The Office's Favorite Quotes:

source: http://www.nbc.com/The_Office/video/clips/the-offices-favorite-quotes/1109154/