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These are SE 1.0 sites. The Site Directory only contains the Trilogy sites (SO/SF/SU/MSO/StackApps) and all public SE 2.0 sites.

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What is "Trilogy site"? and what is the difference between "SE 1.0" and "SE 2.0"? – chanchal1987 Aug 17 '10 at 15:45
    
@chanchal Trilogy is SOFU (Stack Overflow, Server Fault and Super User) – HoLyVieR Aug 17 '10 at 16:12
    
@HoLyVieR: and what is the difference between "SE 1.0" and "SE 2.0"? – chanchal1987 Aug 17 '10 at 16:15
    
@chan: SE 1.0 are StackOverflow-like sites created before the launch of Area 51. SE 2.0 are those created via Area 51. See blog.stackoverflow.com/2010/04/changes-to-stack-exchange. – kennytm Aug 17 '10 at 17:26

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