Answer based on context:

From 1995 to 2011, the Horizon League has sent 24 teams to the NCAA Mens Division I Basketball Tournament.  Those clubs have produced 22 wins in those 14 years, including five "Sweet 16" appearances, making the Horizon League the only Mid-major conference with Sweet 16 participants in at least five of the last nine tournaments (2003, 2005, 2007, 2010 and 2011). Four schools from the conference have produced "modern-day" Sweet 16 appearances - Loyola (1985 NCAA Mens Division I Basketball Tournament), Xavier (1990 NCAA Mens Division I Basketball Tournament), Butler (2003 NCAA Mens Division I Basketball Tournament, 2007 NCAA Mens Division I Basketball Tournament, 2010 NCAA Mens Division I Basketball Tournament and 2011 NCAA Mens Division I Basketball Tournament), and Milwaukee (2005 NCAA Mens Division I Basketball Tournament). The Horizon League has compiled a 15-8 record in the past five years in the NCAA tournament, ranking tops among all NCAA Division I conferences for winning percentage in that span. Butler appeared in the mens national championship game in both 2009-10 Butler Bulldogs mens basketball team and 2010-11 Butler Bulldogs mens basketball team, losing both times. Since the NCAA began seeding teams in 1979, Loyolas 4 seed in the 1985 tournament is the best for a Horizon League team. The Horizon League currently holds the best winning percentage among non-Automatic Qualifying conference in the mens NCAA basketball Tournament (.488, 7th overall amongst the 31 Division I conferences).

Which schools made appearances in the Sweet 16 from 2004 to 2008?
Butler