Microsoft will appoint former Nokia CEO Stephen Elop as its new head of Devices and Studios, replacing current head Julie Larson-Green.
The announcement comes via an internal Microsoft memo dispatched by Larson-Green and obtained by Geekwire, which details the change.
Elop will take control of the division which oversees Xbox and Surface tablets, while Larson-Green will move into the 'My Life & Work' team - otherwise known as Applications and Services - which oversees products including Bing and Skype.
The change isn't effective immediately: Larson-Green will remain in Devices and Studios until the Nokia acquisition is sealed.
Microsoft announced in September that it would acquire Nokia's Devices and Services business for €5.4 billion.
"This is a smart acquisition for Microsoft, and a good deal for both companies. We are receiving incredible talent, technology and IP. We've all seen the amazing work that Nokia and Microsoft have done together," Ballmer wrote in a message to employees at the time.
Microsoft announced its new CEO earlier this month in the form of India-born Satya Nadella.