Interxion and CoreSite Announce Transatlantic Cloud Computing Data Centre Alliance.

M2 PRESSWIRE-June 7, 2011-: Interxion and CoreSite Announce Transatlantic Cloud Computing Data Centre Alliance(C)1994-2011 M2 COMMUNICATIONS

RDATE:07062011

AMSTERDAM - INTERXION HOLDING NV, (NYSE: INXN), a leading European provider of carrier-neutral colocation data centre services, today announced a cloud computing-focused data centre alliance with CoreSite (NYSE: COR), a U.S. provider of powerful, network-rich data centres. The alliance addresses dual-continent demand from cloud companies looking for data centre space in Europe and the U.S. as well as cloud customers of both companies looking to expand internationally. The transatlantic cloud data centre alliance reduces the risk and challenges involved with international data centre sourcing between Europe and the U.S. with Interxion and CoreSite providing a seamless sourcing process and similar cloud-optimised peering/network access and colocation environments.

A leading information communication technology analysts firm, The 451 Group, expects the cloud computing industry (including SaaS) to grow at a compound annual growth rate (CAGR) of 24%, reaching $16.7B in the year 2013. CoreSite and Interxion address this demand with 1.8 million square feet in key cloud computing markets such as Amsterdam, London, Paris, Frankfurt, Dublin, Zurich, Silicon Valley, Los Angeles, New York, and Northern Virginia, in addition to other European and North American locations. The companies offer similar cloud-optimised data centre design, including carrier-neutral, network-dense colocation environments, abundant power, uptime greater than 99.999%, and advances in energy efficiency and security.

Additional synergies include the companies' cloud outreach programmes, Interxion's Cloud Hub and CoreSite's CloudCommunity. The cloud outreach programmes bring together infrastructure (IaaS), platform (PaaS) and software as a service (SaaS) providers, as well as system integrators and network providers. Both companies also offer cloud test lab and demo environments for cloud providers in pre-launch and enterprises with private clouds in beta in select data centres.

This alliance will also allow the companies to address the transatlantic demand from the fast-growing digital media and content sectors, which also require high availability and well-connected data centre environments for the effective aggregation, management and distribution of on-demand and real-time online content. Interxion and CoreSite are both carrier-neutral data centre providers, offering direct access to hundreds of connectivity partners, including Tier 1 and Tier 2 network service providers, Internet service providers, Europe's public Internet exchanges and leading content distribution networks.

As the market for cloud services continues to grow, companies like Interxion and CoreSite represent an ideal way to reach the highest concentrations of consumers on both sides of the Atlantic. Customers based in the U.S can now move seamlessly into Europe, extending connectivity and presence across the region," said David Ruberg, Chief Executive Officer, Interxion.

"CoreSite remains focused on cloud computing, facilitating its international development, and capitalising on the revenue opportunities it presents," commented Thomas M. Ray, CoreSite President and CEO. "The alliance with Interxion ensures a strong international extension for CoreSite and Interxion cloud customers via an efficient and seamless international data centre expansion process."

About Interxion

Interxion (NYSE: INXN) is a leading provider of carrier-neutral colocation data centre services in Europe, serving over 1,200 customers through 28 data centres in 11 European countries. Interxion's uniformly designed, energy-efficient data centres offer customers extensive security and uptime for their mission-critical applications. With connectivity provided by 350 carriers and ISPs and 20 European Internet exchanges across its footprint, Interxion has created content and connectivity hubs that foster growing customer communities of interest. For more information please visit www.interxion.com.

Interxion Investor Relations Contact

Jim Huseby

Investor Relations

+1-813-644-9399

Interxion Media Contact

Ali Moinuddin, Marketing Director

+44 207 375 7038

alim@interxion.com

About CoreSite

CoreSite Realty Corporation (NYSE: COR) delivers powerful, network-rich data centers that optimize, secure and interconnect the mission-critical IT assets of the world's top organizations. 600+ customers, including Global 1000 enterprises, cloud providers, financial firms, and government agencies, choose CoreSite for reliability, service and expertise in delivering customized, flexible data center solutions. CoreSite offers private data centers and suites, cage-to-cabinet colocation, and interconnection services, such as Any2, CoreSite's Internet exchange. The company's portfolio comprises more than two million square feet, including space held for redevelopment and development, and provides access to over 200+ network service providers via 11 data centers in seven key U.S. economic centers. For more information please visit www.coresite.com.

CoreSite Investor Relations Contact

Investor Relations

+1 303.222.7276

InvestorRelations@CoreSite.com

CoreSite Media Contact

Mark Jobson, Marketing Director

+1 303.405.1004

Mark.Jobson@CoreSite.com

CoreSite Forward Looking Statements

This press release may contain forward-looking statements within the meaning of the federal securities laws. Forward-looking statements relate to expectations, beliefs, projections, future plans and strategies, anticipated events or trends and similar expressions concerning matters that are not historical facts. In some cases, you can identify forward-looking statements by the use of forward-looking terminology such as "believes," "expects," "may," "will," "should," "seeks," "approximately," "intends," "plans," "pro forma," "estimates" or "anticipates" or the negative of these words and phrases or similar words or phrases that are predictions of or indicate future events or trends and that do not relate solely to historical matters. Forward-looking statements involve known and unknown risks, uncertainties, assumptions and contingencies, many of which are beyond the Company's control, that may cause actual results to differ significantly from those expressed in any forward-looking statement. These risks include, without limitation: the timely completion of planed construction, geographic concentration of the Company's data centers in certain markets and any adverse developments in local economic conditions or the demand for data center space in these markets; fluctuations in interest rates and increased operating costs; difficulties in identifying properties to acquire and completing acquisitions; significant industry competition; the Company's failure to obtain necessary outside financing; the Company's failure to qualify or maintain our status as a REIT; financial market fluctuations; changes in real estate and zoning laws and increases in real property tax rates; and other factors affecting the real estate industry generally. All forward-looking statements reflect the Company's good faith beliefs, assumptions and expectations, but they are not guarantees of future performance. Furthermore, the Company disclaims any obligation to publicly update or revise any forward-looking statement to reflect changes in underlying assumptions or factors, of new information, data or methods, future events or other changes. For a further discussion of these and other factors that could cause the Company's future results to differ materially from any forward-looking statements, see the section entitled "Risk Factors" in the Company's Annual Report on Form 10-K for the year ended December 31, 2011, and other risks described in documents subsequently filed by the Company from time to time with the Securities and Exchange Commission.

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