[] [DEPOSIT AGREEMENT DEPOSIT AGREEMENT W I T N E S S E T H T H A T WHEREAS WHEREAS WHEREAS WHEREAS WHEREAS, NOW, THEREFORE ARTICLE I DEFINITIONS All capitalized terms used, but not otherwise defined, herein shall have the meanings set forth below, unless otherwise clearly indicated: ADS Record Date Section 1.1 “ 1 Affiliate Section 1.2 “ Section] [Our Ref VZL\653749\4680361v2 Direct tel +852 2971 3046 Email richard.spoooner@maplesandcalder.com 21Vianet Group, Inc. M5, 1 Jiuxianqiao East Road, Chaoyang District, Beijing 100016 People’s Republic of China 13 October 2011 Dear Sirs 21Vianet Group, Inc. Company Registration Statement” Shares Plan We have examined the Registration Statement on Form S-8 to be filed by 21Vianet Group, Inc., a Cayman Islands exempted company] [Consent of Independent Registered Public Accounting Firm Ernst & Young Hua Ming Shanghai, People’s Republic of China October 13, 2011 EX-23.1 4 d242811dex231.htm CONSENT OF ERNST & YOUNG HUA MING]