sonuunifyUnify Square, a Bellevue-based startup that helps companies implement Skype for Business, has reeled in another $4 million in funding.

The fresh cash is part of a $12.2 million Series B round of funding led by Microsoft, which also participated in the original $8.2 million Series B round this past February.

Other original Series B investors like Bridge Bank, Stanford University, and former executives at Ariba, Yahoo, and IBM also participated in today’s follow-on funding.

Unify Square helps its clients, many of which are Fortune 500 corporations, monitor and manage Skype for Business. The company 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.

skype-logo-feb_2012_rgb_500While still at Microsoft, Aggarwal realized the need for a startup that could help companies use Skype for Business, and in turn help employees communicate effectively in the workplace.

“We’re different from other solution providers in the marketplace since we’re very closely aligned with Microsoft and have developed the only truly comprehensive full-service software and services offering that focuses exclusively on the Skype for Business platform,” Aggarwal said. “Our solutions address every phase of a Skype for Business deployment, from strategy and design, through to user adoption and finally to ongoing operations, delivering unmatched IT Pro flexibility, automation and analytics for business intelligence.”

The fresh funding will be used to continue growing out the company’s technology and attracting new customers. Founded in 2007, Unify Square has raised $26.2 million to date and employs slightly less than 100 people worldwide.

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