Apple Computer CEO Steve Jobs clearly knows that too. He didn't miss a beat when a shareholder asked him if he had any thoughts on Longhorn, the next version of Windows.
"They are shamelessly copying us," he said during Thursday's annual meeting.
"They can't even copy fast," he said.
Some of Apple's advances can be protected by patents, he said, but not all.
"Innovation is the only way to win," he said. "You just have to stay ahead of people."
There has been a fair amount of finger-pointing of late, with Windows chief Jim Allchin recently suggesting it was Apple doing the copying.