Reller agrees with the go-forward approach of a single marketing leader and will support Capossela through the transition into his new role. She will then take time off and pursue other interests outside the company, he added.

"This change in marketing structure provides an opportunity for Mark Penn to play a new leadership role at the company as EVP, Chief Strategy Officer," Nadella added.

He said: "One of my consistent themes has been a point I made in my original mail -- we all need to do our best work, have broad impact and find real meaning in the work we do."

He added that coming together as teams fuels this on a day-to-day basis and having the senior leadership team set both pace and example means a lot to him.

"I have discussed this point in various forms with the SLT and have asked for their 'all in' commitment as we embark on the next chapter for the company. We need to drive clarity, alignment and intensity across all our work," he added.

Microsoft appointed Nadella as CEO on February 4, replacing Steve Ballmer, as the world's largest software firm expanded its focus to devices and cloud infrastructure.

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