One day ahead of Yahoo's second quarter earnings report, a financial firm has suggested that investors give the company their support - and their money. ThinkEquity upgraded its rating on Yahoo from "Hold" to "Buy." The imminent earnings call was the first reason for that move. ThinkEquity predicted that Yahoo will report $1.162 in net revenue, versus a consensus estimate of $1.156 billion. The operating income forecasts are then $187 million versus $178 million,