The 4.0 version is the first release under the FileCatalyst banner. The new release offers new functionality, improved compatibility with all the browsers and more deployment felxibility.

4.0 fetures include:

- New user/admin templates with simplified menu structure
- Users can be part of Multiple Groups
- Admins can assign maximum bandwidth and default transfer protocol for each user
- Improved Group Permissions including Read / Write permissions,
-Group folder location and FTP Server Location
- New File Area applet, based on the 2-way FileCatalyst applet, it includes: UDP Acceleration, RSYNC (delta transfers), Auto-detect connection with HTTP fallback, On-the-fly compression and Progrssive Transfers
- New upload and download applets based on FileCatalyst Applets with added acceleration, auto-detect connection with HTTP fallback and on-the-fly compression
- Direct access to user's storage folder from admin interface
- New licensing format based on the server hardware rather than on IP address
- LDAP/AD over SSL
- Authentication switch, that supports both directory and internal database users
- Added support for Opera and Safari (Mac) web browsers on user side only, admins still need to use either Internet Explorer or Firefox.
- Support for FTPS in FTP/FC Sites and locations.