Microsoft walked away from its bid to buy Yahoo on Saturday, after the Internet company turned down its $33-per-share offer.
"The key decisions on that will be made by Microsoft CEO Steve Ballmer, who took a look at Yahoo and decided that, on our own, he likes the stuff that we're doing," Gates said in response to a reporter's question about Microsoft's plans.
"I wouldn't rule out some partnerships but we don't have anything imminent there," he added.
Gates' comments were part of a media pool report. He spoke after meeting South Korean President Lee Myung-bak to discuss cooperation with South Korean companies.
Microsoft courted Yahoo to capitalize on the rapidly growing market for Internet advertising, which has long been served by Yahoo's search, e-mail and web communities.
It is also trying to fend off the expansion of Google, which has made inroads into Microsoft's home turf with a portfolio of web-based applications.
Microsoft now needs to convince investors it has a viable alternative to fix an online business that has racked up nine straight quarters of losses.