But many analysts remain unconvinced. Barclays Capital's Doug Anmuth points out that for the deal to work for Yahoo!, it needs to maintain its search market share. Microsoft, he says, is guaranteeing revenue per search by country for the first 18 months, but not revenue itself. The deal is also bad for Yahoo, Mr Anmuth asserts, because it has not factored in the possibility of what happens when Microsoft's Bing takes market share straight from Yahoo!, and not Google as intended.