 Complete the following phrase:  The 2008 OFC Nations Cup was the eighth edition of the OFC Nations Cup, and the first under a new format that was introduced. It took place as a series of as a home-and-away round-robin tournament on FIFA match dates in 2007 and 2008. Doubling as the qualification tournament for the 2010 FIFA World Cup, the tournament was substantially different from earlier editions: 2004 champions Australia did not compete after leaving the Oceania Football Confederation for the Asian Football Confederation, and for the first time since the 1996 OFC Nations Cup, no fixed venue was used. Unlike the 