David Sacks, co-founder of business social-networking company Yammer, which was acquired by Microsoft in 2012, is leaving Microsoft.
Sacks tweeted today:
Thank you to my current and former YamFamily for 6 great years and to Microsoft for the last two. I look forward to new adventures.
— David Sacks (@DavidSacks) July 24, 2014
Microsoft sent a statement, saying:
We thank David for his commitment to Yammer and Microsoft and wish him the best in his future endeavors. Yammer has grown tremendously since the acquisition in 2012, and is now an integral part of Office 365 and used by more than 500,000 organizations. As part of our long-term plan, David has played an instrumental role over the past two years in building a strong leadership team to set a solid direction for Yammer as part of Microsoft Office 365 and our vision for enterprise social.
ZDNet’s Mary Jo Foley noted that Sacks’ departure comes as Microsoft is moving Yammer into the Office 365 and Outlook development teams, with a member from those Microsoft teams moving south to head the Yammer engineering team in San Francisco.
Microsoft had purchased Yammer for $1.2 billion in 2012. At the time, Microsoft was excited about Yammer’s potential in business social networking, and CEO Steve Ballmer was especially enthused about Yammer’s “viral adoption method” by which it grew its user base.
For a while, Microsoft regularly touted the growth in Yammer’s number of registered users: From 5 million at the time of the acquisition to 8 million a year later in June 2013. Microsoft has not said how many registered Yammer users there currently are.