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Apple CEO Tim Cook holds the new iPad Air during an Apple announcement at the Yerba Buena Center for the Arts in San Francisco, California. - 

Once notorious enemies, IBM and Apple have announced a partnership, with IBM developing more than 100 business apps for Apple. Plus, with Bank of America's disappointing earnings report, a look at what banks are dealing with this profit reporting season. Also, more on how campaign strategists maximize the effectiveness of email.

Follow David Brancaccio at @DavidBrancaccio