[AGREEMENT OF JOINT FILING Dated: January 15, 2015 KING VENTURE HOLDINGS LIMITED KINGSOFT CORPORATION LIMITED] [EXECUTION VERSION PURCHASE AGREEMENT dated as of November 29, 2014 among 21VIANET GROUP, INC., KING VENTURE HOLDINGS LIMITED and CERTAIN OTHER PARTIES NAMED HEREIN TABLE OF CONTENTS Article 1 Definitions Section 1.01 Definitions 1 Section 1.02 Other Definitional And Interpretive Provisions 5 Article 2 Sale And Purchase Of The Sale Securities Section 2.01 Agreement to Sell and Purchase 6 Section] [EXECUTION VERSION AMENDMENT NO. 1 TO PURCHASE AGREEMENT Amendment Agreement Company This AMENDMENT NO. 1, dated as of January 15, 2015 (this “ RECITALS: Section 10.07 WHEREAS, the parties to the Agreement now desire to amend the Agreement in accordance with Definitions Section 1.02 1. Amendment Schedule 3.03(A) 2. Company Capitalization Prior to the Closing Total Class A Shares 346,803,765] [EXECUTION VERSION INVESTOR RIGHTS AGREEMENT dated as of January 15, 2015 among 21VIANET GROUP, INC., KING VENTURE HOLDINGS LIMITED, XIAOMI VENTURES LIMITED and CERTAIN OTHER PARTIES NAMED HEREIN TABLE OF CONTENTS ARTICLE 1 Definitions Section 1.01 . Definitions 1 Section 1.02 . Other Definitional and Interpretative Provisions 5 ARTICLE 2 Corporate Governance Section 2.01 . Investor Nominee Director 6 Section] [EXECUTION VERSION th Dated this 15 21VIANET GROUP, INC. __________________________ REGISTRATION RIGHTS AGREEMENT TABLE OF CONTENTS Page ARTICLE 1 Definitions 1 ARTICLE 2 Registration Rights 4 Section 2.01. Demand Registration Rights 4 Section 2.02. Piggyback Registration Rights 5 Section 2.03. Form F-3 Registration 7 Section 2.04. 8 Section 2.05. Information From Investors] [(Name of Issuer) Class A Ordinary Shares, Par Value $0.00001 (Title of Class of Securities) 90138A103 (CUSIP Number) Francis Ng King Venture Holdings Limited Kingsoft Tower No. 33 Xiaoying West Road Haidian District, Beijing 100085 The People’s Republic of China Telephone: +(86) 10 82325515 With a copy to: Z. Julie Gao, Esq. Skadden, Arps, Slate, Meagher & Flom LLP 42/F,]