2000.5 is an authorized and fully sanctioned re-release of the year 2000, since many people today look back on 2000 as a bit of a disappointment in terms of what people perceived 2000 to be vs. what it actually was like. The ".5" suffix was chosen by a panel of world leaders to conveniently place 2000.5 between 2000 and 2001 when sorting USENET posts.