Past e-mail notices about the dataset

• Jul. 24, 2006 (important notice)
  
• Aug. 16, 2006 (important notice)
  
• Jan. 5, 2007 (notice)
  
• Mar. 30, 2007 (1) (very important notice)
  
• Mar. 30, 2007 (2) (notice)
  
• Jun. 14, 2007 (important notice)
  
• Nov. 15, 2007 (important notice)
  
• Oct. 1, 2009 (notice)
  
• May 27, 2010 (important notice)
  
• Nov. 17, 2011 (notice)