It failed. The company took a $7.6 billion writedown on the Nokia deal in July 2015, with a plan for a more focused phone portfolio. Another writedown and more staff cuts followed in 2016.
Speaking at a Salesforce event a few months after the big Nokia markdown in 2015, Nadella did a demonstration using an iPhone.
"It's a pretty unique iPhone," he said, according to a Business Insider report. "In fact, I'd like to call it the 'iPhone Pro' because it's got all of the Microsoft software and applications on it."
By 2017, with Android and iOS having taken firm control of the smartphone market, Microsoft had cut support for Windows Phone 8.1. Joe Belfiore, a vice president at the company, made it clear on Twitter that Microsoft would not be coming out with new Windows Phone features.
A few days later, Nadella made the matter even clearer, telling GeekWire, "the reality is that we cannot compete as a third ecosystem, with no share position, and attract developers."
Meanwhile, Nadella was busy refining what Microsoft users do on the other big mobile operating systems. His first major appearance as CEO was to announce the launch of Office for iPad. Office support on Android phones and tablets followed within a few months.
Microsoft brought its Edge browser — which debuted in Windows 10 — to Android and iOS, and there's an Android app launcher from Microsoft. SwiftKey, a popular virtual keyboard app that users can install on Android and iOS devices, was acquired by Microsoft in 2016. Even Microsoft's classic card games for Windows arrived on the two dominant mobile operating systems.