Microsoft TechNet is a Microsoft program and resource for technical information, news, and events for IT professionals. Along with a website, they also produce a monthly subscription magazine titled "TechNet Magazine".
TechNet was originally available only to customers with paid subscriptions; however, it has been expanded to include public information, webcasts, local events, and free newsletters. They have also started an open source blog on April 6, 2006 called Port 25 to publicly explore that business model and provide discussion forums. 
As of July 18, 2006, the Sysinternals tools were merged into TechNet.
TechNet's primary web presence at technet.microsoft.com is a collection of sites for the IT professional community that provide information, documentation, and discussion which is authored both by Microsoft and by the community at large. Recent emphasis on and incorporation of applications such as forums, blogs, library annotations, and social bookmarking is changing the nature of the TechNet site from a one-way information service to an open dialog between Microsoft and the IT professional community.  The main website, and most of its constituent applications below are available in 12 or more languages.
Similar to the MSDN Library which contains technical information for software developers, the TechNet Library is a source of technical information for IT professionals and advanced users. The technical content is freely available on the web and on CDs and DVDs. The discs are published monthly and contain the complete Microsoft Knowledge Base, service packs, security updates, resource kits, technical training, operations and deployment guides, white papers, case studies, all the downloads on the Microsoft.com Download Center, and such other information.
TechNet Forums are the web-based forums used by the community to discuss a wide variety of IT professional topics. TechNet Forums were migrated to an all-new platform during 2008 that provided new features designed to improve efficiency such as inline preview of threads, AJAX filtering, and a slide-up post editor.
Social bookmarking on TechNet Social was first launched in 2008, built on a new web platform that has user-tagging and feeds at its core. The goal of the social bookmarking application is to provide a method whereby members of the IT professional community can:
The initial release of the application provides standard features for the genre, including a bookmarklet and import capabilities. The TechNet web site is also starting to incorporate feeds of social bookmarks from experts and the community, displayed alongside feeds from relevant bloggers.
Founded in 2005, TechNet Magazine is a monthly print magazine that provides ITPros working with Microsoft technologies information about planning, operating, and optimizing their systems. TechNet Magazine has a print circulation of 100,000 readers in the US. Additionally, TechNet Magazine is published in 11 languages online at technetmagazine.com.