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Microsoft hasn't upped its offer to buy Yahoo and isn't negotiating behind closed doors, Microsoft chairman Bill Gates said. "We sent them a letter and said we think that's a fair offer. There's nothing that's gone on other than us stating that we think it's a fair offer," Gates told the AP. "They should take a hard look at it." Microsoft's offer continues to hover around $29 dollars a share, down from $31 — though anyone who wants $31 a share in cash can take the money and run.