What NHL team won after losing 3 games in the playoffs?

Answer 1

The language of this question is ambiguous.

by 'won' is it meant,

• won the next game
• won the series
• won the Stanley Cup

Losing 3 games, does this mean:

• Losing the first 3 games and going down 3-0 in the series?
• Losing 3 games in a row at any point in the series?
• Winning a series 4-3?

Please ask your question more specifically.

The Toronto Maple Leafs and the New York Islanders. (? to what question?)