Microsoft has confirmed that thousands of Hotmail accounts have been compromised in a phishing attack.
BBC News has seen a list of more than 10,000 email accounts and passwords which had been posted online.
The software giant, which owns the web-based e-mail system, said that it "had launched an investigation".
Phishing involves using fake websites to lure people into revealing personal details such as bank accounts or login names and other private data.
"We are aware that some Windows Live Hotmail customers' credentials were acquired illegally and exposed on a website," said a Microsoft spokesperson.
"Upon learning of the issue, we immediately requested that the credentials be removed and launched an investigation to determine the impact to customers."
Quick change
Graham Cluley, consultant at security firm Sophos, told BBC News that the published list may just be a subset of a longer list of compromised accounts.
"We still don't know the scale of the problem," he told BBC News.
Technology blog neowin.net was the first to publish details of the attack. It said the accounts were posted on 1 October to pastebin.com, a website commonly used by developers to share code.
Although the details have since been removed, BBC News and Neowin has seen a list of 10,028 names beginning with the letters A and B.
BBC News has confirmed that the accounts are genuine and predominantly originate in Europe.
The list included details of Microsoft's Windows Live Hotmail accounts with email addresses ending hotmail.com, msn.com and live.com.
Mr Cluley advised Hotmail users to change their password as soon as possible.
"I'd also recommend that people change the password on any other site where they use it," he said.
Around 40% of people use the same password for every website they use, he added.
Hotmail is currently the largest web-based email service.
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Monday 5 October 2009
Thousands of Hotmail users hacked
Microsoft has confirmed that thousands of Hotmail accounts have been compromised in a phishing attack.
BBC News has seen a list of more than 10,000 email accounts and passwords which had been posted online.
The software giant, which owns the web-based e-mail system, said that it "had launched an investigation".
Phishing involves using fake websites to lure people into revealing personal details such as bank accounts or login names and other private data.
"We are aware that some Windows Live Hotmail customers' credentials were acquired illegally and exposed on a website," said a Microsoft spokesperson.
"Upon learning of the issue, we immediately requested that the credentials be removed and launched an investigation to determine the impact to customers."
Quick change
Graham Cluley, consultant at security firm Sophos, told BBC News that the published list may just be a subset of a longer list of compromised accounts.
"We still don't know the scale of the problem," he told BBC News.
Technology blog neowin.net was the first to publish details of the attack. It said the accounts were posted on 1 October to pastebin.com, a website commonly used by developers to share code.
Although the details have since been removed, BBC News and Neowin has seen a list of 10,028 names beginning with the letters A and B.
BBC News has confirmed that the accounts are genuine and predominantly originate in Europe.
The list included details of Microsoft's Windows Live Hotmail accounts with email addresses ending hotmail.com, msn.com and live.com.
Mr Cluley advised Hotmail users to change their password as soon as possible.
"I'd also recommend that people change the password on any other site where they use it," he said.
Around 40% of people use the same password for every website they use, he added.
Hotmail is currently the largest web-based email service.
PERSONAL MESSAGE-Please change your passwords kids xxxxxxx
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