Former Microsoft CEO Steve Ballmer didn't mince words in a fiery letter submitted during the sentencing of Joseph Sanberg, a founder he had invested in who pleaded guilty to fraud. "I was duped and feel silly," Ballmer wrote, expressing his personal regret over supporting Sanberg's venture and detailing the significant financial harm the fraudulent scheme has caused him as an investor.

Ballmer's rare public admission provides a stark reminder that even the most experienced tech investors can fall victim to sophisticated fraudsters. The billionaire's condemnation underscores the far-reaching consequences of Sanberg's deception, not just for Ballmer's portfolio but potentially for other investors drawn into what turned out to be a fraudulent enterprise disguised as innovative entrepreneurship.