Citrix Systems, Inc. (NASDAQ:CTXS) today announced that more than 10 percent of Global Fortune 500 companies have downloaded and activated its Citrix® XenServer™ virtualization platform for production use in the last four months, with activations among large enterprises spiking significantly after the release of XenServer 5.5 in June. Since making XenServer available for free unlimited production deployment earlier this year, more than 150,000 users have downloaded the product from hundreds of download sites in over 50 countries. With its latest release, XenServer has set a new standard for free virtualization, going beyond the basic hypervisors that have been free for years by adding powerful features such as centralized multi-node management, built-in storage and full live motion. By providing a free, full-featured alternative that dramatically lowers the entry price of virtualization, Citrix has saved companies of all sizes millions of dollars and provided compelling value to IT organizations as they face shrinking budgets.

“Many industry observers assumed a free XenServer product would not have much appeal outside of mid-sized enterprises and large scale cloud providers,” said N. Louis Shipley, group vice president and general manager, XenServer Product Group at Citrix. “While XenServer has clearly been very popular in those traditionally strong segments, our traction within the Global Fortune 500 is growing much faster than most expected. XenServer already has a strong presence in this base as a part of existing Citrix XenDesktop and XenApp deployments, but the number of large enterprises putting it into production purely for server virtualization in the last few weeks has been nothing short of amazing. At the rate these deployments are growing, XenServer is going to take a lot of folks by surprise.”

A big reason for the recent surge among large enterprise organizations has been the release of XenServer 5.5 in June, adding a wide range of new enterprise-class capabilities. The Burton Group, in fact, recently certified Citrix XenServer 5.5 and its Citrix Essentials™ 5.5 management add-on as one of only two hypervisor platforms in the industry to meet 100 percent of the analyst firm’s required features for enterprise production. To be certified as enterprise production-ready under Burton Group’s comprehensive evaluation criteria, a server virtualization platform must pass a rigorous examination of virtualization, computing, storage, networking, security, and management capabilities.

Additional Value with Citrix Essentials

While users have everything they need with XenServer to deploy and centrally manage full enterprise-class virtualization on any number of servers with no upfront costs, those who need more advanced virtualization management capabilities can purchase Citrix Essentials for XenServer. The Citrix Essentials product line also extends the enterprise management capabilities of Microsoft® Windows Server® 2008 Hyper-V and Microsoft System Center, helping customers create highly scalable, manageable and agile virtual infrastructures within a Microsoft environment. Citrix Essentials enhances both of these high-growth virtualization platforms by adding expanded storage integration, automated lab and stage management and dynamic workload balancing. This combination enables broad interoperability that makes it easier for customers to manage virtual machines across heterogeneous virtualization environments throughout the full application lifecycle, from lab and testing to production.

XenServer 5.5 is available for download at http://www.citrix.com/freexenserver, as well as hundreds of other download sites worldwide. Citrix Essentials 5.5 for XenServer and Hyper-V are also available for purchase or a 30-day trial version at http://www.citrix.com/essentials.

About Citrix Systems, Inc.

Citrix Systems, Inc. (NASDAQ:CTXS) is a leading provider of virtualization, networking and software-as-a-service (SaaS) technologies for more than 230,000 organizations worldwide. Its Citrix Delivery Center™, Citrix Cloud Center™ (C3) and Citrix Online Services product families radically simplify computing for millions of users, delivering applications as an on-demand service to any user, in any location on any device. Citrix customers include the world’s largest Internet companies, 99 percent of Fortune Global 500 enterprises, and hundreds of thousands of small businesses and prosumers worldwide. Citrix partners with over 10,000 companies worldwide in more than 100 countries. Founded in 1989, annual revenue in 2008 was $1.6 billion.

For Citrix Investors

This release contains forward-looking statements which are made pursuant to the safe harbor provisions of Section 27A of the Securities Act of 1933 and of Section 21E of the Securities Exchange Act of 1934. The forward-looking statements in this release do not constitute guarantees of future performance. Investors are cautioned that statements in this press release, which are not strictly historical statements, involve a number of factors that could cause actual results to differ materially, including risks associated with the uncertainty in the IT spending environment and a downturn in economic conditions generally, revenue growth and recognition of revenue, products, their development and distribution, product demand and pipeline, competitive factors, the Company’s key strategic relationships, acquisitions and related integration risks as well as other risks detailed in the Company’s filings with the Securities and Exchange Commission. Citrix assumes no obligation to update any forward-looking information contained in this press release or with respect to the announcements described herein.

Citrix®, Citrix Cloud Center™, Citrix Delivery Center™, Citrix Essentials™ , XenApp™, XenDesktop™ and XenServer™ are trademarks of Citrix Systems, Inc. and/or one or more of its subsidiaries, and may be registered in the U.S. Patent and Trademark Office and in other countries. All other trademarks and registered trademarks are property of their respective owners.

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