[jedbrown]

Different example: Xinjiang, the largest administrative region in China (17% of the land area) was disconnected from all internet and phone from early July 2009 until May 2010 (because China wanted to be the sole purveyor of information regarding ethnic unrest in the region). There may not be many people using hotmail in that region, but anyone who could not afford to travel 1000 kilometers to a different region for email would not have logged in during that period.