A lot of AT&T customers use Yahoo to handle their accounts and services.
The massive hack Yahoo disclosed last week is a headache for Verizon, the telecom giant set to take ownership of the company early next year.
Rival AT&T should be nervous too.
That's because many AT&T customers get the option to use -- yep, you guessed it -- a Yahoo Mail account to manage services like home broadband, wireless and pay-television services.
It's the outgrowth of a partnership formed 15 years ago between Yahoo and AT&T (then called SBC Communications), bringing AT&T broadband customers to Yahoo's search engine and media services, including Yahoo Mail. At the time, industry watchers hailed the deal as a landmark partnership that would better combat the growing power of AOL and Microsoft's MSN portal.
Today, AOL is part of Verizon, Microsoft's MSN is no more and AT&T likely isn't feeling so great about the deal.
The Yahoo hack compromised at least half a billion accounts containing user names, email addresses and passwords. That makes it the biggest hack ever. US Sen. Mark Warner has asked the Securities and Exchange Commission to i nvestigate.
The hack puts AT&T in an uncomfortable position. The company is still waiting for data from Yahoo on the specific customers who may have been affected, according to a person familiar with their dealings.

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