'Microsoft Product Activation tries to reduce counterfeit software, and to make sure that Microsoft customers receive the software quality that they expect,' a company support document stated. Wednesday, Microsoft defended product activation on the Mac with the same reasoning that it has used in the past for Office on Windows. A copy of Office 2010 in reduced mode will not let users edit or print documents, however. Instead, Office 2010 drops into what Microsoft calls 'Reduced Functionality Mode,' which lets users open the applications and view previously-created documents. Nor does the Windows suite go DOA if it has not been activated.