Quest Software Delivers Greater Security, Enhanced Notification and Reporting with Group Policy Manager Version 2.5; New Features Further Augment Microsoft Group Policy Management Console.

ALISO VIEJO, Calif. -- Quest Software, Inc. (Nasdaq:QSFT), a leading provider of application, database and infrastructure management solutions, today announced the general availability of version 2.5 of Quest Group Policy Manager. Group Policy Manager helps administrators create, test and implement Windows Group Policy in a controlled way. With this new version, the product has been redesigned with a client/server architecture for more granular and secure delegation of authority to make changes to Group Policy. In addition, change reporting and notification features have been significantly enhanced.

"The Microsoft Group Policy Management Console provides a strong foundation for managing Group Policy," said Jackson Shaw, senior director of product management for Active Directory and Integration Solutions, Quest Software. "With Group Policy Manager we build on the strong foundation of GPMC to give administrators even greater, more granular control over Group Policy. Through the integration offered by our Vintela Authentication Services product, the power of Group Policy can also now be extended to Unix and Linux environments."

New features in Group Policy Manager 2.5 include:

--Client/server architecture - This new architecture locks down Active Directory so that no changes to Group Policy can be made outside the Group Policy Manager application.

--Container hierarchy view - Administrators can organize Group Policy Objects (GPOs) into containers and sub-containers for user-defined levels of granularity in granting permission to change GPOs.

--Improved notification system - Group Policy administrators can subscribe to automated notification when changes are made to specified GPOs, and these notifications include one-click access to complete detail on all changes made.

--User-defined labels - History comments can be included in the form of labels, easing rollback to earlier GPO versions identified by specific labels.

--New troubleshooting reports - New reports are provided to help users diagnose or troubleshoot Group Policy issues. These include reports on GPO consistency, linked/unlinked Group Policy, GPO security reports and more.

In addition, because Quest's Vintela Authentication Services allows Unix and Linux systems to join the Active Directory domain -- functionally extending the benefit of Group Policy into Unix and Linux environments -- non-Windows GPOs can also be natively managed through Group Policy Manager.

"As attractive as it is, Group Policy can still be complex," said Nick Nikols, senior analyst, Burton Group. "For example, the more GPOs a manager applies to a user, the more complex it is to manage user settings. However, when used properly, Group Policy can greatly improve a company's administrative efficiency and security."

Pricing and Availability

North American pricing for Group Policy Manager begins at $8 per managed user account. Version 2.5 is available immediately. To download the software, and for more information about other Quest products for Active Directory management, visit http://wm.quest.com/products/grouppolicymanager.

About Quest Infrastructure Management

Quest Software, Microsoft's 2004 Global Independent Software Vendor Partner of the Year, provides solutions that simplify, automate and secure Active Directory, Exchange and Windows, as well as integrate Linux and Unix into the managed environment. Quest's Infrastructure Management products deliver comprehensive capabilities for secure management, migration and integration of the heterogeneous enterprise.

About Quest Software, Inc.

Quest Software, Inc. delivers innovative products that help organizations get more performance and productivity from their applications, databases and infrastructure. Through a deep expertise in IT operations and a continued focus on what works best, Quest helps more than 18,000 customers worldwide meet higher expectations for enterprise IT. Quest Software can be found in offices around the globe and at www.quest.com.

Quest and Quest Software are registered trademarks of Quest Software, Inc. The Quest Software logo and all other Quest Software product or service names and slogans are registered trademarks or trademarks of Quest Software, Inc. All other trademarks and registered trademarks are property of their respective owners.

Forward-Looking Statements

This release may include predictions, estimates and other information that might be considered forward-looking statements, including statements concerning the availability and market acceptance of our new version of Quest Group Policy Manager. These statements are based on current expectations and assumptions that are subject to risks and uncertainties. Actual results could differ from those anticipated as a result of various factors, including the impact of economic conditions on our customers; variations in the size and timing of customer orders; competitive products and pricing; rapid technological change; risks associated with the development and market acceptance of new products; disruptions caused by acquisitions of companies and/or technologies, including risks relating to integration of the combined companies; risks associated with international operations; and the need to attract and retain qualified personnel. For a discussion of these and other related risks, please refer to our recent SEC filings, including our Annual Report on Form 10-K for the year ended December 31, 2004, and the Current Report on Form 10-Q for the quarter ended September 30, 2005. Readers are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date thereof. We undertake no obligation to update forward-looking statements to reflect events or circumstances after the date thereof.