X.500 (2008) is the latest version of X.500. This is the 6th edition of X.500, and was approved by the ITU-T in November 2008. Approval by ISO as ISO/IEC 9594 is expected this year. There are no major changes relative to the 5th edition (X.500(2005)) and the protocols are fully interoperable. More information can be found on http://www.x500standard.com/.