CHICAGO--June 9, 2004-- R.R. Donnelley & Sons Company announced today that it expects its second-quarter 2004 Non-GAAP earnings per diluted share to be $0.30. Non-GAAP earnings per share exclude certain items that the company does not expect to occur in the ordinary course of business, or are unrelated to the ongoing operations of the business. These items include acquisition-related charges and restructuring and restructuring-related charges that are not currently determinable but may be significant. For that reason, the company is unable to provide GAAP (Generally Accepted Accounting Principles) earnings estimates at this time. The company believes that non-GAAP earnings per share is useful because that information is an appropriate measure for evaluating the company's operating performance. Internally, the company uses this non-GAAP information as an indicator of business performance, and evaluates management's effectiveness with specific reference to this indicator. This measure should be considered in addition to, not a substitute for, or superior to, measures of financial performance prepared in accordance with GAAP.