Press Release

Citrix to Establish Virtual Infrastructure Security Validation in Collaboration with SignaCert

September 9, 2009

FORT LAUDERDALE — Citrix Systems, Inc. (NASDAQ:CTXS) today announced it is working with SignaCert, the leading provider of IT compliance solutions based on whitelisting methods, to include Citrix Systems software measurements in the SignaCert Global Trust Repository (GTR). This collaboration will provide objective, third-party validation of Citrix-built software for IT security, compliance and systems management of virtual infrastructures, enabling Citrix customers and partners to explore innovative uses for Citrix desktop and server virtualization products such as XenDesktop™, XenApp™ and XenServer™, including dynamically managing applications and packages in workloads. Additionally, SignaCert will license the Data Exchange Format (DEF) to customers at no charge to help them leverage the whitelist data method for custom uses in their Citrix environments.

"Virtualization presents a 'killer platform' for our software whitelisting services, which are quickly becoming an industry accepted approach to information security, compliance and systems management," said Wyatt Starnes, Founder and CEO of SignaCert. "Our ability to provide third-party Security Content Automation Protocol (SCAP) validation for Citrix streaming and virtualization technologies will create a competitive leapfrog opportunity for Citrix."

The SignaCert Global Trust Repository uses known-provenance and vendor-independent software measurements, or whitelists, to enable new enterprise IT security methods. These whitelists provide a standardized way to enforce security and compliance of third-party software for enterprise computing environments, as well as more advanced uses such as software attestation in high-assurance platforms. The technology permits virtual machines (VM) and their applications to be securely authenticated, so that when a VM is moved – between the enterprise data center and a cloud, for example – the user can be confident that the workload originated with their enterprise customer and it has not been altered outside of policy in any way, and that there have been no file and structure changes, additions or deletions to the application stack.

"Our collaboration with SignaCert is further demonstration of the Citrix commitment to addressing customer concerns about the security, compliance and operational stability of virtual infrastructures," said Kurt Roemer, chief security strategist, Citrix Systems. "Citrix believes that a standards-based approach to software measurement will build trust and further spur adoption of desktop and server virtualization."

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™, 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.

About SignaCert

SignaCert is the leading provider of end-to-end and partner-based IT compliance solutions based on known-provenance whitelist technology. These methods allow SignaCert's direct customers to rapidly achieve and prove continuous compliance for the systems that deliver critical business services. The SignaCert architecture is designed to seamlessly integrate with existing change processes and continuously monitor critical business services without disruption.

Additionally, SignaCert's OEM and ISV Partners can supply to, or license content from, the SignaCert Global Trust Repository (GTR), adding new and important capabilities to their product offerings. All use cases are supported by a rich repository of vendor-independent software measurements. These "white" or "allow" list methods enable SignaCert's patented technology to be quickly deployed and provide immediate visibility into the actual state of IT infrastructure.

Founded in 2004 by 34-year IT security and compliance industry veteran Wyatt Starnes, SignaCert has assembled a world class team of industry leaders with hands-on IT experience for its executive team, board of directors, and advisory board.

SignaCert's end-customers span a wide variety of industries, including financial services, government, and healthcare.