At long last, Microsoft Office comes to the iPhone

Over the past few years, Microsoft has been inching closer to making Office available on any device. By launching its Office Mobile for iPhone app on Friday, Microsoft is just about there.

Well, kind of.

The app, which launched Friday in Apple's App Store, has a catch. It's available (and free) only for users who subscribe to Office 365, Microsoft's cloud-based Office program that costs $100 per year. That means if you're using Office 2010 or Office 2013, you're out of luck.

In a research note, Nomura analyst Rick Sherlund called the app's release "a very limited first step." He noted that Microsoft is likely keeping Office Mobile off the iPad to give Windows 8 and the Surface tablet "a chance to gain traction."

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