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Business-focused social network Yammer has acquired document collaboration startup OneDrum, the companies jointly announced today. Financial terms of the deal were not disclosed.

Yammer provides companies with their own private social network that employees use to quickly communicate and update their activity throughout the day. (Disclosure: VentureBeat writers use Yammer to communicate on the job.) And while Yammer currently offers some document storage, the OneDrum software will allow businesses to share, sync, and collaborate on Microsoft Office documents in real-time.

“It’s impossible to separate the conversation from the content,” said Yammer CTO Adam Pisoni in an interview with VentureBeat. “But, there is no end-all solution right now where you can create, discover, collaborate, and share content without going between a bunch of different applications.”

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Yammer plans to launch a OneDrum document-sync desktop application this summer. The app will have a folder for each Yammer group users create under the broader Yammer account, and will sync documents immediately upon saving. Later on the company plans to add tools that will let people search for anything within the shared documents without having to leave Yammer. It’ll also allow people to view shared documents on multiple platforms, such as the Web, smartphones, and tablets.

But perhaps the biggest addition OneDrum offers is the ability to transform your Microsoft Office docs into a collaboration tool that rivals search giant Google’s Google Docs web app. Users can view changes to a document in a real-time, and much like Google Docs, color-coded cursors identify different users collaborating in the document.

“Most companies use Microsoft Office every day, so adding a social layer through Yammer makes a lot of sense,” Yammer CEO David Sacks told VentureBeat.

U.K.-based OneDrum is the first acquisition for Yammer, which recently closed a $85 million round of funding. OneDrum previously raised a total of $1.62 million in funding. It will bring all 10 employees to Yammer, with CEO Jasper Westaway leading the integration of the two products.

We’ve embedded a demo video from Yammer showing off some of the new integrated social document sharing.

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