Unify Square, which snagged an additional $4 million from investors, builds software and support tools designed to help businesses manage Microsoft’s Skype for Business.

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Unify Square has added $4 million more in funding from investors including Microsoft, bringing the Bellevue startup’s haul this year to $12.2 million.

The fundraising, completed in July and announced Tuesday, includes contributions from new investors — Stanford University and technology-focused Bridge Bank of San Jose, Calif.

Unify Square builds software and support tools designed to help businesses manage Skype for Business, the Microsoft communications software for instant messaging, voice and video talk formerly known as Lync.

The company in February announced an $8.2 million fundraising led by Microsoft.

Hundreds of software companies make a living reselling or adding features to Microsoft’s array of business software, but Microsoft rarely invests directly in them, said Sonu Aggarwal, the Microsoft veteran who founded Unify Square in 2008. The firm’s leadership ranks include several other former Microsoft employees.

“We act as a fairly important amplifier [to Skype], and help large customers get it right,” Aggarwal said.

Aggarwal said the company plans to use the new cash to build out its software and bolster its sales organization. The company isn’t profitable, he said, but expects to cross that threshold during the fiscal year starting July 2016.

Unify Square has about 100 employees — 30 in Bellevue and the rest in Germany, India, Singapore, Switzerland and the U.K.

Aggarwal was a director and group program manager on teams building Microsoft’s communications products. He co-founded Flash Communications, which Microsoft bought in 1998.

Unify Square says its clients include major companies such as consumer-goods conglomerate Unilever, energy giant Shell and Microsoft.

“There’s a big market opportunity, a big need for businesses to get products that ensure reliability and voice quality,” said Aggarwal.