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Longtime Microsoft executive Qi Lu is leaving the company following medical issues that arose from a bicycle accident that took place several months ago, according to sources.

Lu, the executive VP in charge of Microsoft’s applications and services unit, previously ran Microsoft’s search business and spent 10 years at Yahoo before joining Microsoft in 2008.

Many of Lu’s duties will be taken over by Rajesh Jha, a corporate VP who has been leading Microsoft’s Outlook and Office 365 efforts.

Microsoft declined to comment.

Lu was a favorite lieutenant under CEO Satya Nadella, where he led the company’s effort to evolve Office from a desktop suite into a collection of apps and services that ran on mobile devices, including those running iOS and Android.

“We want Office to be a habit,” Lu said in a 2014 interview.

Before Yahoo, Lu was a research staff member at IBM’s Almaden Research Center in Silicon Valley and held positions at Carnegie Mellon University and China’s Fudan University.