WinQuota Corporate 4.0.8

WinQuota Corporate is a fully automatic and real-time disk and folders quota management software for Windows. It was designed especially for administration in large and huge companies, hosting platforms. WinQuota Corporate provides quota management for folders and files separately for any kind of users and groups. It provides support of Active Directory complex structures, including forests and sites, and support of any kind of network users and groups.
WinQuota Corporate guards disk space for any processes and users and provides the way to keep the storage and helps you manage huge storages. WinQuota hard limits cannot be exceeded, but in the case of attempting to use more space than quota set, administrator intervention is not required to unlock/solve quota overflow.
Key features
limit the maximal size of each file or directory
set up different limit values for different users
set up different limit values for different groups
serve any existing user or group credentials from domains
Among other useful features WinQuota Corporate provides detailed reports, command-line interface, and COM API to manage WinQuota from all points you might need.
WinQuota Corporate provides:
SNMP monitoring and SNMP notifications
Web based administration
Windows Clustering support
support of Huge domains and Active Directory forests
support of Itanium platform as well as AMD64
support of Windows 2003 Appliance Edition
Note: Download link 2 is for 64bit system.