Accellion says it has closed the "Dropbox Security Gap” with the launch of a SharePoint plug-in that extendings secure file sharing of files to external users.

"The enterprise customers we work with have invested in SharePoint, but know that it can be cumbersome and expensive to set up external access to SharePoint. When internal users discover they can't share their SharePoint files beyond the firewall, they frequently seek workarounds, including dropbox-style apps, regardless of the security and compliance risks," said Yorgen Edholm, CEO of Accellion.

"With Accellion, no compromises have to be made. Business users have a secure, intuitive, SharePoint file sharing solution for both internal and external file sharing, and the organization is able to protect, track and manage the files that are exchanged."

Accellion secure file sharing supports Microsoft SharePoint 2010 and 2007, and allows users to share any size file or folder directly from SharePoint Document Library to internal and external collaborators.

Tracking files and reporting on document trails for auditing and compliance is claimed to be easier using Accellion.

The Accellion Microsoft Productivity Business suite includes features for monitoring and auditing file sharing activities.