Before the formal takeover offer came, an informal Microsoft takeover of Yahoo was already underway, thanks to Yahoo's hiring of several executives from the software giant. Some have even speculated that Microsoft has encouraged this poaching, using its ex-employees as plants to keep track from the inside on Yahoo's progress. And Microsoft has, in turn, hired its share of Yahoos. How will they fare if Microsoft's $44.6 billion offer goes through?

As we reported first, Yahoo's Scott Gatz confirms he's leaving. Chad Dickerson will move from the Yahoo Developer Network to take over running Advanced Products. This is hardly a promotion for Dickerson; we hear he had a falling out with his boss at the developer group, ex-Microsoftie David Sobeski. Dickerson is now in charge of someday making Fire Eagle a real product. He also gets to work oh so closely with professional conference attendee Salim Ismail. And that brings us to our career advice for Dickerson.

I'm hearing an incredible rumor about David Sobeski, the former Microsoft general manager now opening a Seattle-area office for Yahoo, and I'm not sure whether to believe it. Whispers from well-placed Yahoos are that he took the job under "false pretenses." Translation: They think he's a spy for Microsoft, planted at Yahoo to learn the company's secrets. The new office is to work on something called "DataOS," the technical underpinnings for Yahoo's large-scale Web operations. Microsoft is playing catch-up with Google in Web-based software, and getting hold of Yahoo's technology would be one way to take a massive leap. There may be nothing to the allegations. But if Microsoft hasn't placed a corporate spy at Yahoo yet, I'd have to say I wonder what's taking them so long.