"Hopefully, this will be a key point in both our companies' histories in years to come," Chou said.

The new version of Sync will become available next month. It will synchronize files for all the users who have access to them, across versions of Box for tablets and smartphones as well as PCs and Macs. After a user creates or modifies a file and moves it into Box.net, that file is available to colleagues in its latest updated form. Users can also set up alerts for colleagues and notify them of tasks they need to carry out, such as approving an updated file.

Levie acknowledged concerns around security for cloud-based file management, alongside ease of use.

"Box has to be the easiest way you can securely share information in the enterprise," Levie said.

The Trusted Access feature, available immediately, can be set by an IT manager for all employees. In addition to showing the user which of his devices have been used to access his account, it includes the capability to revoke access to the Box.net software on a smartphone that has been lost or stolen. The Trusted Sharing capability will let administrators define access to specific documents based on domain and user group.