Microsoft CEO Steve Ballmer, after he and his underlings spent months saying they'd moved on from the notion of buying Yahoo, says that a deal still makes "economic sense." Yahoo's stock leapt 17 percent, though it wasn't clear from his remarks, made at a Gartner conference in Florida, whether he was talking about a search partnership or a full acquisition. Either way, Ballmer: Make up your frickin' mind. There are 3,500 Yahoos who are about to lose their jobs , not to mention that cushy post-Microsoft severance package Jerry Yang ginned up. Oh, wait, there's more!Microsoft spokesperson Frank Shaw just emailed me, asking me to attribute this to a Microsoft spokesperson: "Our position hasn’t changed. Microsoft has no interest in acquiring Yahoo; there are no discussions between the companies." Says a Microsoft spokesperson. So Microsoft's CEO thinks a Yahoo deal is a good idea — he's just not interested in it. There you have it: Microsoft is officially uninterested in good ideas. We always suspected as much, but it's nice to get it on the record.