10月31日下午，何庆源宣布从诺基亚西门子离职，并同时发出离职公开信，
以下为其撰写的公开信全文：
亲爱的同事们：
我已经服务于诺基亚和诺基亚西门子网络公司7年时间，在过去七年中既愉快又富有挑战性，我们有一支伟大的球队，我们的士气很高，我们将会继续取得良好的经营成果。
1988年以来，我一直工作在大中国电信市场，过去的20年我目睹了其巨大的增长和成功。2006年以来，我一直在试图找出在这个市场是什么？越来越多的竞争与新兴当地球员和利润正在减少。几年前，谁相信华为将成为全球主要的竞争对手？时代已经发生了变化，中国成为第三个把人送到太空中的国家。21世纪，企业的商业模式将是基于中国和印度这样国家的研发、供应链、制造业和服务业，并投资于各自分布在全球的市场。NSN已经采取了一些主动行动朝着这个方向，但也有更多的，我们必须这样做。
我一直大力倡导的尽早发放3G牌照，正因为这个，媒体称我为“3G总裁”。在我看来，尽早发放3G牌照更有利国外厂商，而现在当地供应商已经开发他们的力量和能力，竞争也将更加激烈。我将不参加这一令人振奋的3G战斗，但我确信在西蒙.克里斯托弗领导下，NSN将取得更大的成功。
我将开始新的一章在我的生活，我想花更多的时间了解其他行业，继续担任Pentair公司、伊利诺伊州欧文斯公司、中钢集团等公司的独立董事。
我将作为美国的亚洲多技术协会的董事和副总裁，帮助中国培育信息和通信技术产业的新一代青年企业家。还将与一家私营风险投资基金投资测试设备，Web2.0的互联网社区，移动软件，移动安全，定制的移动设备和电信服务。
我对诺基亚和诺基亚西门子公司过去给予我的支持表示感谢，我将继续往返在北京、美国、加拿大之间的定期旅游，试图找到更多的时间来改善我的高尔夫技术。
以下为其公开信英文版全文：
DearColleagues
Aftersevenyearsof service with Nokia and Nokia Siemens Networks, I will be leaving the company at the end of October. The past seven years was both challenging and enjoyable, we had a great team, our morale was high and we continued to achieve excellent business results.
Ihavebeenworking in the Greater China Telecommunications market since 1988; I have witnessed its tremendous growth and success in the past 20 years. Ever since 2006, I have been trying to figure out where this market is going? Competition is increasing with the emerging local players and profit is decreasing, a few years ago, who would believe Huawei will become a major global competitor? Time has changed, China became the third country to put a man in space, and we would be naive to think that technology will continue to be a barrier for Chinese vendors. The new business model in the 21st century is for companies to anchor their R&D, supply chain, manufacturing and services in China/India, while investing in distribution in the respective global markets. NSN has taken some initiatives in this direction, but there are much more that we need to do.
Ihavebeena strong advocate of early 3G licensing in China while we were still part of Nokia, for this reason I earned the title of "3G President" from the media. In my view, the earlier 3G comes the better position the foreign vendors will be in, now the local vendors have developed their strength and capability, competition will be much tougher. I will not be part of this exciting 3G battle but I am sure NSN will do well with the strong support from Simon, Christoph and under the leadership of ZZ.
Iwillbestarting a new chapter in my life, I wish to spend more time to learn about other industries by continuing to serve as Independent Director on Boards of US and Chinese Public companies: Pentair Inc. (NYSE: PNR) in the water business, Owens Illinois Inc. (NYSE: OI) in the glass packaging business, and Sinosteel, China's largest mining, equipment and servicing company serving the steel industry.
Ihavebeenserving the Asia America MultiTechnology Association Beijing Chapter as one of the Founder, Director of the Board and Vice President since 2004 ( www.aamachina.com.cn ), AAMA is a 30 years old Association from the Silicon Valley. I will continue to serve in this capacity with the Association's mission to help to nurture China 's next generation young entrepreneurs in the Information and Communications Technology industry. I am also working with Venture Capital funds under a private company call Kiina Group to invest in Chinese start up companies in this industry; our portfolio companies include test equipment, Web 2.0 Internet community, mobile software, mobile security, customized mobile devices and telecom services.
