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 Sonu Aggarwal
Sonu Aggarwal.

Unify Square, a Bellevue-based startup that helps companies implement Skype for Business, has raised $4 million in funding to expand its existing network operations center in India.

The eight-year-old company helps its clients, including more than 50 Fortune 500 corporations, monitor and manage Skype for Business, which just received a big update on Monday. Unify Square is a longtime partner of Microsoft, where CEO and founder Sonu Aggarwal once worked on the product roadmap and development for Live Communications Server and Office Communications Server – projects that would precede Lync, or what is now known as Skype for Business.

The fresh cash comes primarily from angel investors and will be used to grow the company’s network operations center in India. Total funding for Unify Square, which counts Microsoft, Bridge Bank, and Stanford University was investors, is now just north of $30 million.

“The expansion of our existing network operations center is an agile move on our part to respond directly to customer demand for our software and services offerings for Skype for Business and Skype for Business Online,” Aggarwal said in a statement.

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