Business-software company Yammer has agreed to sell itself to Microsoft for more than $1 billion, the Wall Street Journal reported, citing a source familiar with the transaction.

According to the Journal, it is unclear when the acquisition will be completed and announced.

A Microsoft spokesman declined to comment.

Representatives for San Francisco-based Yammer didn’t immediately respond to requests for comment.

Yammer has often been called “Facebook Inc.” for the workplace because it creates a private social network inside a corporation.

The purchase of Yammer could add social-networking functions to Microsoft’s popular Office suite of software.

Microsoft has an existing product, called SharePoint, with some functions that overlap with Yammer.

ComputerWorld noted that Yammer’s software is cloud-based, so it’s a natural for it to become a part of Office 365, Microsoft’s Web-based collaboration and e-mail suite.

Bloomberg News had earlier reported Microsoft was in discussions to acquire Yammer.