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Amazon CEO Jeff Bezos, Apple CEO Tim Cook, and Google CEO Sundar Pichai were among those to celebrate the mark that Allen left on the tech world.
He died from complications relating to non-Hodgkin's lymphoma, a cancer he was first diagnosed with in 2009. Allen disclosed earlier this month that it had returned after a period of remission.
Scroll on to see how tech leaders responded to news of Microsoft cofounder Paul Allen's death.
"Very sad to hear of Paul Allen’s passing. His passion for invention and pushing forward inspired so many. He was relentless to the end. My heart goes out to Paul’s family and friends."
"Our industry has lost a pioneer and our world has lost a force for good. We send our deepest condolences to Paul’s friends, the Allen family and everyone at Microsoft."
"Paul Allen’s contributions to our company, our industry and to our community are indispensable. As co-founder of Microsoft, in his own quiet and persistent way, he created magical products, experiences and institutions, and in doing so, he changed the world."
"I have learned so much from him — his inquisitiveness, curiosity and push for high standards is something that will continue to inspire me and all of us at Microsoft. Our hearts are with Paul’s family and loved ones. Rest in peace."
Sundar Pichai: "We lost a great technology pioneer."
"We lost a great technology pioneer today - thank you Paul Allen for your immense contributions to the world through your work and your philanthropy. Thoughts are with his family and the entire Microsoft community."
"I am heartbroken by the passing of one of my oldest and dearest friends, Paul Allen. From our early days together at Lakeside School, through our partnership in the creation of Microsoft, to some of our joint philanthropic projects over the years, Paul was a true partner and dear friend. Personal computing would not have existed without him.
"But Paul wasn't content with starting one company. He channeled his intellect and compassion into a second act focused on improving people's lives and strengthening communities in Seattle and around the world. He was fond of saying, 'If it has the potential to do good, then we should do it.' That's the kind of person he was.
"Paul loved life and those around him, and we all cherished him in return. He deserved much more time, but his contributions to the world of technology and philanthropy will live on for generations to come. I will miss him tremendously."