Microsoft is reportedly planning a round of job cuts that could be the biggest in company history.

The software giant is looking to scale back as it integrates Nokia, the Finland-based smartphone maker that Microsoft acquired earlier this year, according to a Bloomberg report.

The changes will likely be in engineering and marketing as well as in sections where Microsoft and Nokia talent overlap, sources familiar with the matter told Bloomberg.

"Nothing is off the table in how we think about shifting our culture," CEO Satya Nadella told Bloomberg in an interview last week.

Microsoft's last major slim-down was in 2009, when the company cut 5,800 jobs, or 5 percent of its employees. The software company had 127,104 employees as of June 5 following the addition of 30,000 people as part of the Nokia acquisition this past spring.

The tech companies had agreed to the deal last September, but the closure was delayed due to pending approvals. The billion-dollar acquisition of Espoo, Finland-based Nokia has been an important step for Microsoft as it looks to grow its Windows mobile phone platform.

As described on Nokia's website, the deal was for "an agreement with Microsoft whereby Microsoft would purchase substantially all of Nokia's Devices & Services business."

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