This study is a double-blind, double-dummy, randomized, placebo- and active-controlled, multicenter, parallel-group study of adult subjects with a primary clinical diagnosis of COPD. Approximately 800 subjects were to be randomized in this study. Study participation consisted of a total of eight (8) study visits over approximately four (4) months for each subject. This study was previously posted by Sepracor Inc. In October 2009, Sepracor Inc. was acquired by Dainippon Sumitomo Pharma., and in October 2010, Sepracor Inc's name was changed to Sunovion Pharmaceuticals Inc.