LinkedIn, whose headquarters were in Ireland was acquired by Microsoft in partnership with Yahoo. The professional social networking site, purchased for $1.5 billion last year and later Microsoft announced its intention to acquire LinkedIn for $26.2 billion in June, a deal which closed this month. The deal closed last month which followed by an attempt from hackers who used DDOS and rendered the services unavailable.  The weekend attempts and today success of the  database being hacked is a major blow to the Microsoft.