Having gained ground in terms of online search market share for the last couple of months, Microsoft lost ground to competitors Google and Yahoo in April.

The statistics, released by research firm Nielsen/NetRatings, found Microsoft dropped 1.1% in April from its 10.1% share in March, while Google increased its leader’s position with 55.2%, up from 73.7% in March. Yahoo was up slightly to 21.9%, from 21.8% in the previous month.

The figures, which show the share of searches performed online, put AOL fourth place for April, although it’s share dipped to 5.4% from 5.8% in March, while Ask.com held steady in fifth place with 1.8% of search queries.

Microsoft last week announced its intention to acquire aQuantive, a US-based online marketing agency for $6 billion, in a bid to boost its presence in this market, as it looks to unify it’s online brands under the ‘Live’ banner.