[21Vianet Announces Cloud Storage Solutions by StorSimple BEIJING, October 30, 2014 - 21Vianet Group, Inc. (Nasdaq:VNET) (“21Vianet” or the “Company”), the largest carrier-neutral Internet data center services provider in China, today announced that hybrid cloud storage solutions offered by StorSimple, a data storage optimization solution, are now available to all Windows Azure customers in China. StorSimple offers advanced, automatic storage] [FORM 6-K 21Vianet Group, Inc. M5, 1 Jiuxianqiao East Road, Chaoyang District Beijing 100016 The People’s Republic of China (86 10) 8456 2121 x ¨ Form 20-F ¨ ¨ 21Vianet Group, Inc. Shang-Wen Hsiao Chief Financial Officer 6-K 1 d813949d6k.htm FORM 6-K]

[21Vianet Establishes Joint Venture With Foxconn BEIJING, October 10, 2014 - 21Vianet Group, Inc. (Nasdaq:VNET) (“21Vianet” or the “Company”), the largest carrier-neutral Internet data center services provider in China, today announced that the Company has established Smart Time Technologies Limited (“Smart Time Technologies” or “Joint Venture”), a strategic joint venture, with the leading global electronics manufacturer, Foxconn Technology Group (TWSE:2354)] [FORM 6-K 21Vianet Group, Inc. M5, 1 Jiuxianqiao East Road, Chaoyang District Beijing 100016 The People’s Republic of China (86 10) 8456 2121 x ¨ Form 20-F ¨ ¨ 21Vianet Group, Inc. Shang-Wen Hsiao Chief Financial Officer 6-K 1 d804630d6k.htm FORM 6-K]

[21Vianet Forms Strategic Partnership With China Internet Network Information Center (CNNIC) BEIJING, Oct. 2, 2014 (GLOBE NEWSWIRE) — 21Vianet Group, Inc. (Nasdaq:VNET) (“21Vianet” or the “Company”), the largest carrier-neutral Internet data center services provider in China, today announced a strategic partnership with China Internet Network Information Center (CNNIC), the government administrative agency in charge of managing domestic domain name registry] [21Vianet Group, Inc. By : Name : Shang-Wen Hsiao Title : Chief Financial Officer 6-K 1 d799917d6k.htm FORM 6-K]

[Microsoft and 21Vianet Announce WebDirect Payment Services for Windows Azure Services in China BEIJING, Sept. 26, 2014 (GLOBE NEWSWIRE) — Microsoft Corporation (Nasdaq:MSFT) (“Microsoft”) and 21Vianet Group, Inc. (Nasdaq:VNET) (“21Vianet” or the “Company”), announced that Windows Azure services’ WebDirect payment services are now available to all customers in China. Customers can purchase public cloud services at international standards directly from] [21Vianet Group, Inc. Shang-Wen Hsiao Chief Financial Officer 6-K 1 d799964d6k.htm FORM 6-K]

[21Vianet Group Inc. Issues Second Response to Short Seller’s Allegations BEIJING, Sept. 18, 2014 (GLOBE NEWSWIRE) — 21Vianet Group, Inc. (Nasdaq:VNET) (“21Vianet” or the “Company”), the largest carrier-neutral Internet data center services provider in China, today posted its second response to a short seller’s allegations on its Investor Relations website, a copy of which is attached. 21Vianet rejects the baseless] [21Vianet Group, Inc. Shang-Wen Hsiao Chief Financial Officer 6-K 1 d792977d6k.htm FORM 6-K]

[21Vianet Issues CEO Letter to Shareholders BEIJING, Sept. 15, 2014 (GLOBE NEWSWIRE) — 21Vianet Group, Inc. (Nasdaq:VNET) (“21Vianet” or the “Company”), the largest carrier-neutral Internet data center services provider in China, today issued the following letter to its shareholders from Mr. Josh Chen, Co-Founder, Chairman of the Board and the Chief Executive Officer of the Company. Dear Shareholders, My name] [FORM 6-K 21Vianet Group, Inc. M5, 1 Jiuxianqiao East Road, Chaoyang District Beijing 100016 The People’s Republic of China (86 10) 8456 2121 x ¨ Form 20-F 21Vianet Group, Inc. Shang-Wen Hsiao Chief Financial Officer 6-K 1 d791142d6k.htm FORM 6-K]