EXHIBIT 99.1

Employees

I have some exciting news to share with you.

Today, Internap is announcing it is acquiring VitalStream, a leader in audio and video streaming service, and a global provider of integrated rich media content delivery services.

This acquisition provides tremendous opportunities for our customers, VitalStream’s customers, and each and every one of you. The combination of Internap’s premier network optimization solutions and VitalStream’s Content Distribution Services and Ad-Insertion services will create the most comprehensive solution for the delivery and monetization of applications and content.

Attached is a news release with more details about this announcement (a FAQ document will be sent out later this morning) . In the coming weeks, we will have more to share with you about VitalStream and what the company brings to Internap’s portfolio of services.

In the meantime, please know how much the Internap leadership team appreciates your hard work over the past many months. We have marked some amazing milestones together in the last year, and this announcement is yet another step forward in our efforts to create shareholder value.

We look forward to continued success together.

Best Regards,

Jim DeBlasio

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Additional Information Regarding the Transaction

The announcement of the transaction is neither a solicitation of a proxy, an offer to purchase nor a solicitation of an offer to sell shares of the Company’s common stock. Internap and VitalStream intend to file with the Securities and Exchange Commission (“SEC”) a Joint Proxy Statement/Prospectus on Form S-4. In addition, other relevant materials in connection with the proposed transaction will be filed with the SEC. INVESTORS IN INTERNAP AND VITALSTREAM ARE URGED TO READ CAREFULLY THE JOINT PROXY STATEMENT/PROSPECTUS AND OTHER RELEVANT MATERIAL WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT INTERNAP, VITALSTREAM AND THE TRANSACTION. Any offer of securities will only be made pursuant to the Joint Proxy Statement/Prospectus. The documents will be available without charge on the SEC’s web site at www.sec.gov. A free copy of the final Joint Proxy Statement/Prospectus may also be obtained from Internap and VitalStream through their Investor Relations contacts provided above.

The officers and directors of VitalStream may have interests in the proposed acquisition, some of which may differ from, or may be in addition to, those of the stockholders of VitalStream generally. A description of the interests that the officers and directors of the companies have in the proposed transaction will be available in the Joint Proxy Statement/Prospectus.

In addition, Internap and VitalStream, their respective officers, directors and certain of their management and employees may be deemed to be participants in the solicitation of proxies from the stockholders of Internap and VitalStream in favor of the acquisition. Information about the officers and directors of Internap and their ownership of Internap securities is set forth in the proxy statement for Internap’s 2006 Annual Meeting of Stockholders filed with the SEC on April 26, 2006. Information about the officers and directors of VitalStream and their ownership of VitalStream securities is set forth in the proxy statement for VitalStream’s 2006 Annual Meeting of Stockholders filed with the SEC on June 20, 2006. Investors may obtain more detailed information concerning the participants by reading the Joint Proxy Statement/Prospectus when it is filed with the SEC.

Internap “Safe Harbor” Statement

Certain information included in this letter constitutes forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. All statements, other than statements of historical facts, including, among others, statements regarding the combined company, the effects of the transaction, the dilutive and accretive effects of the transaction in 2007, 2008 and beyond, synergies from the transaction and growth opportunities. Those statements include statements regarding the intent, belief or current expectations of Internap, the combined company and members of our management team, as well as the assumptions on which such statements are based, and equally are identified by the use of words such as “may,” “will,” “seeks,” “anticipates,” “believes,” “estimates,” “expects,” “projects,” “forecasts,” “plans,” “intends,” “should” or similar expressions. Forward-looking statements are not guarantees of future performance and involve risks and uncertainties that actual results may differ materially from those contemplated by forward-looking statements. The transaction and the achievement of any anticipated benefits from the transaction are subject to significant risks and uncertainties. Many important factors that may affect Internap’s and the combined company’s business, results of operations and financial condition include, but are not limited to, our ability to sustain profitability; the ability to successfully integrate the operations of Internap and VitalStream; our ability to compete against existing and future competitors; pricing pressures; our ability to respond successfully to the evolution of the high performance Internet connectivity and services industry; our ability to respond successfully to technological change; our ability to deploy new access points in a cost-efficient manner; the availability of services from Internet network service providers or network service providers providing network access loops and local loops on favorable terms or at all; failure of third party suppliers to deliver their products and services on favorable terms or at all; failures in our network operations centers, network access points or computer systems; fluctuations in our operating results; our ability to secure adequate funding; the incurrence of additional restructuring charges; our ability to operate in light of restrictions in our credit facility, including our ability to maintain ratios set forth in the credit facility; our ability to attract and retain qualified personnel; our ability to protect ourselves and our customers from security breaches; our ability to protect our intellectual property; our ability to successfully complete future acquisitions; risks associated with international operations; claims relating to intellectual property rights; government regulation of the Internet; the dilutive effects of our stock price due to outstanding stock options and warrants; future sales of stock; effects of natural disasters or terrorist activity; and volatility of our stock price.

Our Annual Report on Form 10-K, subsequent Quarterly Reports on Form 10-Q, recent Current Reports on Form 8-K and other Securities and Exchange Commission filings discuss the foregoing risks as well as other important risk factors that could contribute to such differences or otherwise affect our business, results of operations and financial condition. The forward-looking statements in this release and the related conference call for analysts and investors speak only as of the date they are made. We undertake no obligation to revise or update publicly any forward-looking statement for any reason.