IMPORTANT NOTICE 

IMPORTANT: You must read the following disclaimer before continuing. The following disclaimer applies to the attached offer to purchase (the “Offer to Purchase”), whether received by e-mail or otherwise received as a result of electronic communication, and you are therefore advised to read this disclaimer page carefully before reading, accessing or making any other use of the Offer to Purchase. In accessing the Offer to Purchase, you agree to be bound by the following terms and conditions, including any modifications made to them from time to time, each time you receive any information from us at any time. Capitalized terms used but not otherwise defined in this disclaimer shall have the meaning given to them in the Offer to Purchase.

The Offer to Purchase should not be forwarded or distributed to any other person and should not be reproduced in any manner whatsoever.

Confirmation of your representation: You have been sent the Offer to Purchase at your request and by accessing the Offer to Purchase you shall be deemed to have represented to 21Vianet Group Inc. (the “Company”), Citicorp International Limited in its capacity as trustee  (the “Trustee”), Credit Suisse (Hong Kong) Limited and Barclays Bank PLC in their capacity as dealer managers (the “Dealer Managers”) and D.F. King Ltd. in its capacity as tender and tabulation agent (the “Information and Tender Agent”), that:

  1. you are a holder or a beneficial owner of any of the outstanding 7.0% Senior Notes due 2020 (ISIN: XS1640517907; Common Code: 164051790) (the “Notes”) issued by the Company;
  2. you are not, and are not acting for the account or benefit of, a U.S. Person (as defined in Regulation S under the U.S. Securities Act of 1933, as amended);
  3. you are not, and are not acting for the account or benefit of, a person located or resident in, the United States (as defined below) and will not be a resident of or located in the United States at the time of your acceptance of the Offer described in the Offer to Purchase
  4. you are not, and are not acting for the account or benefit of, a person to whom it is unlawful to send the Offer to Purchase or who is not permitted to participate in the Offer under any other applicable laws and regulations including the offer and distribution restrictions (as outlined in the section entitled “Offer Restrictions” in the attached Offer to Purchase);
  5. you are not located in Italy or, if you are located in Italy, you are an authorized person or are tendering the Notes through an authorized person (such as an investment firm, bank or financial intermediary permitted to conduct such activities in Italy in accordance with the Legislative Decree No. 58 of 24 February 1998, as amended, Commissione Nazionale per le Società e la Borsa (“CONSOB”) Regulation No. 16190 of 29 October 2007, as amended from time to time, and Legislative Decree No. 385 of 1 September 1993, as amended) and in compliance with applicable laws and regulations or with requirements imposed by CONSOB or any other Italian authority;
  6. you consent to delivery of the Offer to Purchase by electronic transmission to you; and
  7. the electronic mail address that you have given to the Company, the Dealer Managers or the Information and Tender Agent, as the case may be, and to which the Offer to Purchase has been delivered, is not in the United States.

The Offer to Purchase hasbeen sent to you in an electronic form. You are reminded that documents transmitted via this medium may be altered or changed during the process of transmission and consequently none of the Company, the Trustee, the Dealer Managers, the Information and Tender Agent or any person who controls, or is a director, officer, employee or agent, of any of them, or any affiliate of any such person, accepts any liability or responsibility whatsoever in respect of any difference between the Offer to Purchase distributed to you in electronic format and the hard copy version available to you on request from the Information and Tender Agent at the address specified on the last page of the Offer to Purchase.

You are reminded that the Offer to Purchase has been delivered to you on the basis that you are a person into whose possession the Offer to Purchase may lawfully be delivered in accordance with the laws of the jurisdiction in which you are located or resident and you may not nor are you authorized to deliver, transmit, forward or otherwise distribute the Offer to Purchase, directly or indirectly, to any other person, and, in particular, they should not be forwarded to any person or address in the United States or to a U.S. Person (as defined in Regulation S under the U.S. Securities Act of 1933, as amended). Any such forwarding, distribution or reproduction of the Offer to Purchase in whole or in part is unauthorized. Failure to comply with this direction may result in a violation of the applicable laws and regulations of the United States or other jurisdictions.

The materials relating to the Offer to Purchase and the offer outlined therein (the “Offer”) do not constitute, and may not be used in connection with, an offer or solicitation in any place where offers or solicitations are not permitted by law. If a jurisdiction requires that the Offer be made by a licensed broker or dealer and the Dealer Managers or any of their respective affiliates is a licensed broker or dealer in that jurisdiction, the offering shall be deemed to be made by the Dealer Managers or such affiliate on behalf of the Company in that jurisdiction.

None of the Company, the Trustee, the Dealer Managers or the Information and Tender Agent makes any recommendation as to whether or not holders of the Notes should tender their Notes pursuant to the Offer.

Restrictions: Nothing in this electronic transmission constitutes an offer to buy or the solicitation of an offer to sell securities in the United States or any other jurisdiction in which such offer would be unlawful.

The communication of the Offer to Purchase is not being made, and the Offer to Purchase has not been approved, by an authorized person for the purposes of section 21 of the UK Financial Services and Markets Act 2000. Accordingly, the Offer to Purchase is not being distributed to, and must not be passed on to, the general public in the United Kingdom. Rather, the communication of the Offer to Purchase as a financial promotion is being made to, and is directed only at: (a) persons outside the United Kingdom; (b) those persons falling within the definition of Investment Professionals (contained in Article 19(5) of the Financial Services and Markets Act 2000 (Financial Promotion) Order 2005, as amended (the “Order”)); or (c) those persons falling within Article 43 of the Order; or (d) high net worth companies, and other persons to whom it may lawfully be communicated, falling within Article 49(2)(a) to (d) of the Order; or (e) any person to whom it may otherwise lawfully be made in accordance with the Order (such persons together being “relevant persons”).

The Offer to Purchase is only available to relevant persons and the transactions contemplated herein will be available only to, or engaged in only with relevant persons, and this financial promotion must not be relied or acted upon by persons other than relevant persons.

The distribution of the Offer to Purchase in certain jurisdictions may be restricted by law. Persons into whose possession the Offer to Purchase come are required by the Company, the Trustee, the Dealer Managers and the Information and Tender Agent to inform themselves about, and to observe, any such restrictions.

NONE OF THE OFFER TO PURCHASE OR ANY RELATED DOCUMENT HAS BEEN FILED WITH THE U.S. SECURITIES AND EXCHANGE COMMISSION, NOR HAS ANY SUCH DOCUMENT BEEN FILED WITH OR REVIEWED BY ANY U.S. STATE SECURITIES COMMISSION OR REGULATORY AUTHORITY OF ANY COUNTRY. NO AUTHORITY HAS PASSED UPON THE ACCURACY OR ADEQUACY OF THE OFFER TO PURCHASE OR ANY RELATED DOCUMENTS.