Yammer was already working on tighter integration with Microsoft's collaboration tools. In April, it made its first acquisition, buying OneDrum, a folder-based file synchronization tool with collaborative editing capabilities. The inset image above shows social tracking of which collaborators changed different cells in a spreadsheet.
Yammer still plans to release an update this summer that will use OneDrum's technology to synchronize desktop folders with file repositories associated with Yammer groups. How will this mesh with technologies from Microsoft, which has file synchronization technologies of its own?