By Brandon

SAN FRANCISCO — Microsoft’s new Windows 10 operating system debuts Wednesday, as the longtime leader in PC software struggles to carve out a new role in a world where people increasingly rely on smartphones, tablets and information stored online. No one’s expected to line up overnight for Windows 10, the way people did 20 years ago for Windows 95. But Microsoft is counting on tens or even hundreds of millions of people to download its latest release for free in the coming months. The launch will be accompanied by a global marketing campaign for an event the company hopes...

SAN FRANCISCO — Jody Kearns doesn’t like to spend time obsessing about her Parkinson’s disease. The 56-year-old dietitian from Syracuse, New York, had to give up bicycling because the disorder affected her balance. But she still works, drives and tries to live a normal life. Yet since she enrolled in a clinical study that uses her iPhone to gather information about her condition, Kearns has been diligently taking a series of tests three times a day. She taps the phone’s screen in a certain pattern, records a spoken phrase and walks a short distance while the phone’s motion sensors...

Criminals stole personal information from tens of millions of Americans in data breaches this past year. Of those affected, one in three may become victims of identity theft, according to research firm Javelin. Whether shopping, banking or going to the hospital, Americans are mostly at the mercy of companies to keep their sensitive details safe. But there are steps you can take to protect yourself against the financial, legal and emotional impact of identity theft — and most of them are free. If you have been hacked, you face a month-slog battle to recover. So how do you fight...