However, the Oilers' surprise playoff run failed to continue, as the Colorado Avalanche defeated them in the next round. In 1997–98, Joseph led the Oilers to another first-round upset. After Colorado took a 3–1 series lead, the Oilers held them scoreless for eight straight periods en route to winning the series in seven games. Dallas and Edmonton met again in the second round, but this time, the Stars were the victors. The Oilers made the playoffs in four of the next six years, but they were defeated after the first round every time. Despite their success over the past two seasons, the Oilers were in trouble off the ice. Owner Peter Pocklington had explored moving the Oilers to Minnesota during the 1990s. In 1998, Pocklington almost made a deal to sell the team to Leslie Alexander, the owner of the Houston Rockets of the National Basketball Association (NBA), who would have moved the team to Houston, Texas. On March 14, 1998, hours before the deadline to keep the team in Edmonton, the Edmonton Investors Group agreed to pay $70 million to buy the club. The EIG were spearheaded by Cal Nichols, who had a commitment to retain NHL hockey in Edmonton. The deal was finalized on May 5, and thus prevented them from being the third Canadian team to move in the 1990s and the fourth former WHA team to move in successive years (Quebec had moved in 1995, Winnipeg in 1996 and Hartford in 1997). The Oilers received support from the NHL for this very reason. In the 1998–99 season, the Oilers joined the Western Conference's Northwest Division. On November 22, 2003, the Oilers hosted the 2003 Heritage Classic, the first regular-season outdoor hockey game in the NHL's history and part of the celebrations of the Oilers' 25th season in the NHL. They were defeated by the Montreal Canadiens 4–3 in front of more than 55,000 fans, an NHL attendance record, at Commonwealth Stadium in Edmonton. The Oilers failed to make the playoffs in the 2003–04 season. The Oilers struggled with their small-market status for several years, but after the wiped-out 2004–05 season, they were aided by a Collective Bargaining Agreement (CBA) between the NHL owners and players. This included a league-wide salary cap that essentially forced all teams to conform to a budget, as the Oilers had been doing for years. A more reasonable conversion rate of Canadian