Version 6.0 of Quest JProbe Features Improved Automation and Reporting, Updated User Interface and New Diagnostic Capabilities

SAN FRANCISCO, Calif., June 28, 2005 – At JavaOne, Quest Software, Inc. (Nasdaq: QSFT), a leading provider of application, database and Windows management solutions, today announced version 6.0 of Quest JProbe® Suite, featuring improved automation and reporting, a revamped user interface and new capabilities that make it faster and easier for developers to resolve complex memory and performance problems in their critical Java and J2EE applications.

“Quest JProbe continues to lead the industry with its new capabilities, depth of analysis and platform support,” said Larry Humphries, vice president of product management, application management solutions, Quest Software. “Java developers need sophisticated tools for identifying memory and performance issues in their code, but more than this, they need an automated proactive testing solution that integrates easily into build and test frameworks. We also believe JProbe’s enhanced user interface will both win new fans and delight long-time users.”

Quest Software’s award-winning JProbe Suite enables Java developers and QA teams to diagnose complex code-level performance, memory and coverage issues, so they can find and fix problems faster. Part of Quest’s Application Performance Management (APM) Suite for the J2EE platform, JProbe helps users accelerate development, contain costs and ensure a faster, more scalable Java application. Version 6.0 offers exciting new features and enhancements, including:

• Improved test automation and reporting capabilities, which enable JProbe to automatically analyze J2EE applications and generate detailed reports allowing managers and developers to ensure code quality and optimization;

• New use case-based memory debugging diagnostics to help developers isolate and resolve memory leak and memory allocation issues;

• New class- and method-level performance metrics to help developers “blueprint” their applications for automatic per-build performance measurement and tracking; and

• An enhanced user interface that includes new tabbed windows that make navigation and J2EE configuration easier.

“A Fall 2004 Forrester survey of 692 technology influencers – those who hold the IT purse strings – indicated that nearly one-third are dissatisfied both with the time it takes their development shops to deliver custom applications and with their quality.” Forrester analyst Carey Schwaber stated in her April 2005 report, Corporate Software Development Fails To Satisfy On Speed Or Quality, “Corporate application development organizations should adopt iterative, incremental development processes, invest more in software quality and elicit customer feedback on a regular basis.”

About Quest Application Management Solutions

Quest Software’s proven application management products help organizations get more performance from both packaged ERP and custom J2EE Web applications. Covering the entire application lifecycle, Quest delivers innovative products that provide code quality and optimization, performance and availability, and change and configuration management. Quest Application Management solutions help IT reliably manage their application environments and access the information required to make informed business decisions while supporting business goals.

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 including Sydney and Melbourne and at www.quest.com.

Quest, Quest Software and JProbe are registered trademarks of Quest Software, Inc. The Quest Software logo, PerformaSure 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 relating the availability and market acceptance of the new release of Quest JProbe Suite. 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; the outcome of pending or future litigation; 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.

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Editorial Contact: Shannon Neat Quest Software (03) 9811 8020 shannon.neat@quest.com