What was the most significant moment in the history of Phoebe and Mike's relationship on Friends?

Phoebe Buffay's relationship with Mike Hannigan on Friends had many memorable moments throughout the show's run, but one of the most significant was their wedding. Mike proposed to Phoebe in the show's 10th season, and after some initial hesitation, she said yes. Planning the wedding was not without its challenges, including a disagreement over whether to have a church wedding or a winter wonderland-themed ceremony.

However, the most significant moment in their relationship came during the actual wedding ceremony. As Phoebe was walking down the aisle, a snowstorm hit New York City, threatening to ruin the wedding. But despite the setback, Phoebe and Mike persevered, holding their ceremony outside in the snow. This beautiful and romantic moment showcased the couple's love for each other and their willingness to weather any storm that came their way.