The “Next Great Frontier” within IT

Quest Software Completes Acquisition of Vizioncore, Latest Move into Virtualization: The “Next Great Frontier” within IT

Further Solidifies Quest’s Position as Leader in the Virtualization Management Market

ALISO VIEJO, Calif. — Quest Software, Inc. (Nasdaq:QSFT) today announced it has completed the acquisition of Vizioncore Inc., a leading provider of disaster recovery and other products for virtual infrastructure management. Initially acquiring a controlling interest in Vizioncore in 2005, Quest broadened its virtualization product portfolio in 2007 with the acquisitions of Invirtus, a provider of virtual machine optimization, conversion and automation products, and Provision Networks, a leader in virtual client and desktop management solutions. As part of the company’s plan to support increasing customer needs for managing their virtual environment, acquiring the remaining equity of Vizioncore marks the latest step in Quest’s effort to strengthen its position as a leader in software that enables companies to manage and enhance their heterogeneous IT infrastructure.

“We see virtualization as the next great frontier within IT,” said Vinny Smith, Quest CEO, “and the completion of the Vizioncore acquisition along with the recent additions of Provision Networks and Invirtus to the Quest family combine to position us as one of the leading pioneers in this emerging market space. As virtualization grows in importance for organizations, the demand for the kind of management products we’ve delivered for years in the database, application and Windows infrastructure areas will increase. Seeing this as the next logical step in helping customers manage the entire IT stack, we’ll be there once again to meet our customers’ needs.”

Quest also announced that Matt Dircks, recently named General Manager of its virtualization business, will initially focus on the Vizioncore product line as he develops the go-to-market plans for Quest’s growing portfolio of virtualization products. “We have a unique opportunity to meet the diverse needs of customers across many market segments with a portfolio of market-leading products, a highly skilled channel of value-added resellers, and a Quest team with demonstrated excellence in serving enterprise customers on a global scale,” Dircks said. He added that Quest has also added industry visionary Scott Herold to the virtualization business as its Lead Architect. “Scott is a recognized expert in the field of virtualization. I look forward to leveraging his unique blend of practical experience, market knowledge, and visionary thinking across the entire virtualization business.”

“The completion of this acquisition signals another major step in Vizioncore’s evolution and growth in the virtualization market,” said David Bieneman, CEO of Vizioncore. “While maintaining the autonomy that has made us successful, we will also be able to leverage technologies developed by and acquired by Quest, such as Invirtus and Provision Networks, to enhance and expand the feature sets of Vizioncore products. This is very positive news for virtualization customers who will enjoy a richer and robust product set that will help them achieve greater levels of ROI from their investments in virtualization platforms.”

“Vizioncore offers a number of products that target many of the requirements faced by IT decision-makers when deploying virtual machine software,” said Dan Kusnetzky, Principal Analyst and President for the Kusnetzky Group, an Acuity Group LLC company. “Vizioncore’s products directly address the needs for monitoring virtual system operation, moving virtual systems from one physical machine to another, diagnosing problems as well as backup in a virtual environment. Organizations moving down the path to a more virtualized environment certainly ought to become familiar with Vizioncore.”

About Vizioncore Inc.

Vizioncore Inc. helps organizations safeguard and optimize their virtualized environments, and allows them to extract the maximum return on their investments in a virtualized platform. Today, nearly 7,000 customers globally use Vizioncore’s products. Vizioncore’s software provides many benefits to users of Windows[R] and Linux environments, by supporting essential strategies for 24x7x365 availability of applications, including backup/restore, business continuity and disaster recovery. Vizioncore products also allow for in-depth monitoring of virtual machines to ensure that maximum performance is achieved, as well as optimization by reducing VMs to their smallest size. Additionally, the company’s solutions support Physical-to-Virtual (P2V) and Virtual-to-Virtual (V2V) conversions, extending virtualization backup strategies to all servers in the data center, both physical and virtual. More than 1,100 partners worldwide, including leaders in the virtualization industry, include Vizioncore products in their offerings to their customers. Vizioncore’s award winning solutions include vRanger Pro, vReplicator, vCharter, vConverter, vOptimizer, vMigrator and vPackager.

About Quest Software, Inc.

Quest Software, Inc. delivers innovative products that help organizations get more performance and productivity from their applications, databases and Windows infrastructure. Through a deep expertise in IT operations and a continued focus on what works best, Quest helps more than 50,000 customers worldwide meet higher expectations for enterprise IT. Quest’s Windows Management solutions simplify, automate and secure Active Directory, Exchange and Windows, as well as integrate Unix, Linux and Java into the managed environment. Quest Software can be found in offices around the globe and at

Quest, Quest Software and the Quest logo are trademarks or registered trademarks of Quest Software in the United States and certain other countries. All other names mentioned herein may be trademarks of their respective owners.

Forward Looking Statements

This release includes forward-looking statements concerning Quest’s strategies and future plans in the server and desktop virtualization markets, anticipated benefits of Quest’s acquisitions of Vizioncore, Provision Networks, ScriptLogic and Invirtus and strategic relationships with other vendors, and expectations of demand for systems management capabilities in this emerging information technology area. 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 risks associated with: adverse changes in general economic conditions; reductions or delays in information technology spending; the rate of customer acceptance and adoption of virtualization solutions; competitive conditions; rapid technological change; the development, market acceptance, distribution and licensing of products; key strategic relationships; disruptions caused by acquisitions and related integration activity; the need to attract and retain qualified employees; and other risks inherent in software businesses. For a discussion of these and other related risks, please refer to our filings with the Securities and Exchange Commission, including our Annual Report on Form 10-K for the year ended December 31, 2006. 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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