Yahoo chief Marissa Mayer posted an apology late Friday for a "frustrating week" experienced by millions of its email service users.
An outage at Yahoo Mail hit its fourth day on Thursday, prompting thousands of furious users to ratchet up their criticism on social media.
An outage at Yahoo Mail stretched into its second day on Wednesday, prompting the US Internet pioneer to apologize to unhappy users.
Even as Silicon Valley's technology companies speak out against the U.S. government's surveillance methods, they are turning a handsome profit by mining personal data and peering into people's online habits.
Microsoft announced it worked with police in Europe and the United States to disrupt a "dangerous" army of virus-infected computers used to hijack searches at Google, Bing and Yahoo.
Tumblr is where the Internet's cool kids hang out. That's why Yahoo paid $1.1 billion to buy the blogging site in one of this year's most buzzed-about deals.
Yahoo made a fresh move Monday to expand as a media group, naming a star "global anchor" to be the face of its digital news brand.
Yahoo Inc. says it plans to sell $1 billion in convertible senior notes in a private placement and will use the money to buy back shares and for other purposes.
Yahoo is expanding its efforts to protect its users' online activities from prying eyes by encrypting all the communications and other information flowing into the Internet company's data centers around the world.
Six of the biggest US technology firms are urging Congress to rein in the National Security Agency by requiring more transparency about surveillance and improved privacy protections.