What would you do if you logged onto your e-mail and received an unfamiliar message: “User name and password do not match”?

Comcast, one of the country’s largest Internet providers, will put a 250 gigabyte-a-month cap on residential users, a move certain to create tension.

In just a few short months, the airlines have discovered to their glee that their customers are willing to pay for most everything from checked bags to pillows and blankets.

Some customers like the company’s responses to online criticism; others see an eerie version of “Big Brother.”

Some customers like the company’s responses to online criticism; others say it’s an eerie version of “Big Brother.”

Comcast is reaching out to customers who complain about its service online. Some like it; others say it’s an annoying, sometimes eerie version of “Big Brother.”

Sprint’s new chief executive, Daniel R. Hesse, has much to do to repair the cellphone operator’s corporate culture and to stem the losses of customers to rivals.

The handcuffs may not be coming off cellphone owners, but they are getting looser.

He had had too much to drink, he wanted to chat, he was afraid of flying, he wanted more drinks and he just got louder and louder.

The financial giant had promised that it would no longer reserve the right to raise interest rates on already-issued credit card.