Speaking at the GPU Technology Conference today, Nvidia CEO Jen-Hsun Huang expressed his disappointment with Windows RT, Microsoft's ARM-based operating system for tablets. "Windows RT is disappointing to us, because we expected to have sold more than we did," explained Huang. "I think everyone expected to have sold more than they did." Huang's comments come shortly after Samsung's CEO, JK Shin, revealed that "smartphones and tablets based on Microsoft's Windows operating system aren't selling very well."

Despite the disappointment, Huang believes Microsoft can put things right in future. Explaining that there's a number of devices that could run Windows RT that don't, Huang said it's "of some importance for Microsoft to continue to invest in Windows RT," irrespective of the poor sales. "They always seem to ultimately get it right," said Huang. "I expect they will because it's too important not to get it right."

Interestingly, Huang said if Microsoft's Outlook email client was available for Windows RT then it would make his "life complete," lending hope to recent reports that Microsoft is testing this particular software. "I'm one Outlook away from computing nirvana, and I just hope he is listening to me right now," he added. "I just know there are smart people up there who are just waiting with bated breath for a very, very thin PC with long battery life that's Outlook compatible."

Sean Hollister contributed to this report.