Microsoft and Starbucks are among 70 corporations, financial institutions, medical centers, and other major organizations that have signed on to a friend-of-the-court brief in support of a challenge to the federal Defense of Marriage Act (DOMA).The organizations are, or represent, major employers who argue that DOMA imposes significant administrative costs, and that it harms their ability to attract and retain talent."Microsoft has joined dozens of corporations, organizations and governments in support of a challenge on constitutionality grounds to the federal Defense of Marriage Act, known as DOMA," the company said in a statement. The amicus brief "points out the significant...