In potentially one of the largest security e-mail breaches ever, a Web site may have allowed people access to millions of private Hotmail accounts.

To correct serious security flaws, Microsoft on Friday disabled the virtual wallet function of its Passport service and has begun notifying partners about the vulnerabilities, the company has confirmed. By Brian McWilliams.

Microsoft has fixed a serious vulnerability in its Hotmail email program that tricks users into sending their usernames and passwords to an outside email address. By Michael Stutz.

Tom Cervenka, a Web programmer at Canadian Specialty Installations, spent last week working on some clever coding to send to his Hotmail account. It tells users account access has been timed out and that they need to re-enter their account and passwor...

A Danish government official has reported a security hole that could allow unauthorized access to private accounts on Hotmail, the free Web email service. The company confirmed the hole exists and said Friday it would patch it within a day. By Michael...

A previously unknown group known as Hackers Unite has claimed responsibility for publicizing Hotmail's security breach, which Microsoft vehemently denied was the result of a backdoor oversight. By James Glave.

Security updates made last month to Microsoft's free email service, Hotmail, may have failed to fix the problem. Not only that, but privacy watchdogs fear that the fix might actually help the company analyze their users' Web browsing habits. By Michae...

No sooner was one catastrophic security flaw closed Monday -- one that exposed millions of Hotmail accounts to prying eyes -- when another one appeared. By Declan McCullagh and Ja.

As outages and service problems continue to plague Microsoft's free email service Hotmail, users who try to cancel their accounts may be in for a surprise: They can't. By Polly Sprenger.

The Hotmail security hole may have been an intentional backdoor that Microsoft built into its system for maintenance purposes, security experts said. By James Glave.