Microsoft is to begin warning users of the Outlook email service when it suspects a government has tried to hack their accounts, the company said on Wednesday.
The policy change at the world's largest software company follows similar moves since October by Facebook, Twitter and Yahoo. Google pioneered the practice in 2012 and said it now alerts tens of thousands of users every few months.
Microsoft has offered alerts about potential security breaches for two years without specifying the likely suspect.
In the statement, the company said: "As the threat landscape has evolved our approach has too, and we'll now go beyond notification and guidance to specify if we reasonably believe the attacker is 'state-sponsored'."
The announcement came after it emerged Microsoft did not tell Hotmail users it suspected Chinese authorities of hacking into more than 1,000 accounts several years ago.
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Microsoft has reported the biggest quarterly loss in its history, as a result of its $7.6 billion (£4.8bn) purchase of Nokia.
The US-based technology giant announced a loss of $2.1 billion (£1.3bn) for the fourth quarter of its financial year, with revenue of $22.2 billion (£14.2bn).
The Windows software maker did however also announce a 117% increase in its Surface tablet business as it continues to do battle with Apple's iPad.
The Surface business is now worth $888 million (£570m), and the Xbox was on the up to, with revenue from the games console up 27%.
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Police said they had made a "significant arrest" today following the 2014 cyber attacks on Sony PlayStation and Microsoft Xbox systems.
An 18 year-old-man was arrested on suspicion of unauthorised access to computer material and officers from the National Cyber Crime Unit seized electronic and digital devices from the teenager's Boundary Street home in Southport.
Deputy Chief Constable Peter Goodman, national policing lead for cyber security, said: "This arrest demonstrates that we will pursue those who commit crime with the false perception they are protected within their own homes or hiding behind anonymous online personas."
An 18-year-old man has been arrested following the cyber attacks on Sony PlayStation and Microsoft Xbox systems last year.
The South East Regional Organised Crime Unit said the teenager was arrested in Merseyside in a joint British and FBI-led operation.
The teenager is being held in Southport, Merseyside, on suspicion of unauthorised access to computer material.
Microsoft is reportedly in advanced talks to buy Mojang, the maker of the hit game 'Minecraft' for $2 billion.
Minecraft is currently the number one paid for game in the Apple App Store.