Yahoo! rejected Microsoft's friendly buyout offer over the weekend, saying that MS's $45bn offer "massively undervalues" the Yahoo! brand. Clearly still thinking it's 1997 and Google doesn't exist yet, Yahoo! is apparently sticking out for $40 a share - a significant increase on Microsoft's $31 offer. That would result in MS having to turn Bill Gates upside down and shake out another $12 billion to get the deal signed...