carlmenezes writes "Ars Technica has up an article discussing Microsoft's latest salvo against IBM. Microsoft's open letter to IBM adds fresh ammunition to the battle of words between those who support Microsoft's Open XML and OpenOffice.org's OpenDocument file formats. Microsoft has strong words for IBM, which it accuses of deliberately trying to sabotage Microsoft's attempt to get Open XML certified as a standard by the ECMA. In the letter, general managers Tom Robertson and Jean Paol write: 'When ODF was under consideration, Microsoft made no effort to slow down the process because we recognized customers' interest in the standardization of document formats.' In contrast, the authors charge that IBM 'led a global campaign' urging that governments and other organizations demand that International Standards Organization (ISO) reject Open XML outright."