It took them nearly 50 years to complete, the longest of any of the three teams.
United fans will be rightly delighted with the outcome. "It was a great performance from everybody in the team".
The criticism was the latest in the back and forth between Souness and Mourinho.
However, Souness hit back on Irish TV on Wednesday night, and remains deeply unconvinced by Mourinho's team, despite their success.
It was the biggest return yet on United's world-record £89.3 million ($115.8 million, 103.2 million euros) investment in Pogba, who celebrated by pointing to the sky.
Peter Bosz's effervescent team caused United some uncomfortable moments, but without ever threatening to pull off an upset.More news: Blake Lively to lead film from 'Big Little Lies' author
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"At a time when we are grieving for the families that have lost loved ones, we have a sport that has brought a little happiness at a hard time", said Beckham, who played 394 games for United between 1992 and 2003. We only got second balls. They, when they got their chances, put them away.
"We totally deserved the win".
For Mourinho and many other managers, the value of the Europa League has increased massively following UEFA's decision to award a Champions League qualifying place to the victor. The club now has every trophy in world football. Manchester - we won for them. "But if I focus on the football side, I am really proud". You won't win our league playing like that.
"Others were let down by a charter flight they thought would bring them to Sweden being cancelled because organisers failed to attract enough bookings".
"I think it would be special". It's all new for them.
"But in a bad season, in a season where sometimes I felt my team is the worst in the world and I am the worst manager in the world, we won three trophies and go to the Champions League by winning a trophy". I don't care about football for now. Would you see Real Madrid play like that?
While United will enjoy this success, a club of such prestige demands standards not only remain high moving forward but that they're lifted too.
United boss Jose Mourinho also paid a special tribute to the people killed in the Manchester terror attack by saying his club "wouldn't think twice" to exchange the Europa League Cup for their lives. "We had to do a job".