IRVINE, Calif., July 20, 2005 – Quest Software Inc. (Nasdaq: QSFT), a leading provider of application, database and infrastructure management solutions, today announced general availability of Quest InTrust for Windows version 8.5, which now collects event log data from more than just Windows-based systems. The product now features support for Linux, Oracle databases and firewalls. At the same time, the company introduces the Quest Compliance Suite for Windows.

“Quest InTrust for Windows helps organizations comply with external regulations and internal policies by securely collecting, storing and reporting on heterogeneous event data,” said David Waugh, vice president, Product Management, Quest Software. “InTrust for Windows is the keystone of our solutions that help IT administrators meet ever-increasing compliance demands, while giving them more secure administrative control of the enterprise.”

New features in InTrust for Windows include:

• Support for Linux – InTrust now offers collection and real-time monitoring of Syslog messages and custom text logs for Red Hat Enterprise Linux ES3 and AS3.

• Support for Oracle databases – Database logs are now collected and data access and user management reporting is provided for Oracle Databases 9i R1, 9i R2 and 10g.

• Firewall log collection and reporting – InTrust now collects audit data from Checkpoint Firewall-1 and the Cisco PIX Firewall. Pre-built collection engines are provided for the Windows, Solaris and Linux versions of Checkpoint and for the Linux and Solaris versions of the Cisco PIX platform.

• Additional collection and analysis features – InTrust eases enterprise-wide data gathering by including text-based logs and providing new wizards for processing even complex log files. InTrust’s new Adaptive Security Analyzer simplifies the process of discovering network activity trends and detecting security anomalies.

InTrust for Windows is a key product in the Quest Compliance Suite for Windows, which is made up of three products – InTrust for Windows, InTrust for Active Directory and Reporter. These solutions enable IT organizations to establish a baseline of who has access to critical information, and then to track how that access is used. Most importantly, the products alert appropriate personnel in real time if that access is used inappropriately. The Compliance Suite automatically generates reports for compliance purposes, including accesses to shared files, user and administrative activity and elevations in access permissions.

“To ensure confidence in critical enterprise IT and application infrastructures, enlightened firms invest in software products that can help them develop, deploy, manage and maintain highly available systems in accordance with the myriad of regulations. Software products such as those that collect, store and report on event log and configuration data offer significant benefit because they represent solutions that are common amongst many, if not all, external regulations,” writes Adrian J. Bowles of the Robert Frances Group in his white paper IT Compliance Strategies for Improved ROI.

Pricing and Availability
North American pricing for InTrust for Windows begins at $449 U.S. per server. To learn more about the Quest Compliance Suite for Windows and to download the software, visit http://wm.quest.com/products/compliance.

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. For more information on Quest Software’s Infrastructure Management solutions, please visit www.quest.com/microsoft.

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, headquartered in Irvine, Calif., 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 InTrust for Windows. 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 10-Q for the quarter ended March 31, 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.