Has Google really left China?

The question of whether or not Google has left China seems a little hard to answer under the current situation. Google has moved part of its search services under the domain name of Google.cn to Hong Kong, but it has maintained its sales team and R&D operations on the Chinese mainland and has not closed its site in China.

Google's "paradoxical" departure has received some harsh comments.
Google's contradictory move highlights the dilemma of a commercial company undergoing self-politicization. What happened to Google in the span of time between when it entered China in 2006 and when it threatened to leave China?