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Here’s the Panda update schedule so far, as we’ve tracked and had confirmed by Google:

Panda Update 1.0 : Feb. 24, 2011
Panda Update 2.0 : April 11, 2011
Panda Update 2.1 : May 10, 2011
Panda Update 2.2 : June 16, 2011
Panda Update 2.3 : July 23, 2011
Panda Update 2.4 : August 12, 2011
Panda Update 2.5 : September 28, 2011
Panda Update 3.0 : October 19, 2011
Panda Update 3.1 : November 18, 2011

Panda Update 3.2 : January 18, 2012
Panda Update 3.3 : February 27, 2012
Panda Update 3.4 : March 18, 2012
Panda Update 3.5 : April 19, 2012
Panda Update 3.6 : April 27, 2012
Panda Update 3.7 : June 8, 2012
Panda Update 3.8 : June 25, 2012