Yammer is widely used by big-name companies (in Australia, the list includes Deloitte, Suncorp and Westfield). The addition of oneDrum will allow a feature that could be described as a 'private Dropbox' - each user will have a Yammer folder, and documents dropped into that folder will be synchronised with other users who belong to the same group within the organisation.

Data is encrypted at rest and in flight.

When documents are edited and saved, the change versions are automatically synchronised. Yammer CEO David Sacks told iTWire that the software keeps a version history to allow reversion, and a variety of rules can be applied in the event of two users making changes to the same document at the same time.

The latter scenario is only a problem when one or more users are offline while they are editing a shared document. The oneDrum software provides for co-editing of Microsoft Office documents, with different highlight colours used to identify different users' changes.

Files stored in Yammer folders are accessible from mobile devices and are searchable within Yammer itself. The company already offers integration with a range of software and services including Microsoft SharePoint and Salesforce.com.