Security Quick Reference - here's a list of security resources for IT Pro, Dev and Consumers alike

Security Quick Reference

Guidance
The Security Guidance Centers provide the most prescriptive security guidance Microsoft has to offer as well as security tools, security response information, such as security bulletins and virus alerts, to assist in securing your environment.  Choose the Security Guidance Center that is right for you

Worldwide Guidance Centre

IT Professionals Guidance Centre
Get overviews and general information as well as product-specific security guidance on the TechNet Security Center and the TechNet IT Solutions Center.

IT Pro Security Community

Guidance for Medium-sized Businesses
The Medium Business IT Solution Series is designed for growing businesses that are progressively increasing the use of IT to empower employees and connect with customers.

Small Businesses
Specifically for small businesses to help prevent costly business interruptions, and help promote continued employee productivity. Find information on the Security Guidance Center for Small Business.

Small Business Security Guide

Download this 62-page guide that helps explain why security is important to your business and provides steps to help protect your small business IT environment.

Consumers
Use the resources available on the Security at Home site to help protect your computer, yourself and your family from viruses, hackers, and other threats.

Worldwide site for Developers - there's an excellent UK site too
The MSDN Security Developer Center pulls together content and resources around specific products and technologies. It provides code samples, community sites, technical articles, documentation, upcoming events, and much more.

Free Training in the USA

Free Training in the UK
Register for free security management training, including security briefings, hands-on labs, security webcasts, and in-depth e-learning for both IT professionals and developers.

Security Webcasts

Security360 with Microsoft Corporate Vice President of the Security Business and Technology Unit

E-Learning Security Training

Communications
Stay on top of the latest security issues quickly and easily by signing up for free Microsoft security communications.  You can find all of these newsgroups, newsletters, notification services and more on the TechNet Security Center. 

Security Newsletter for IT Professionals

Security Notifications Services 

Security Bulletin Webcast

Security Newsletter for home users 

Security Update Alerts for home users 

How to Tell If a Microsoft Security-Related Message is Genuine

Free Tools
Download free tools and updates that help you assess vulnerabilities and strengthen the security of your environment.  You can find all of these tools, technologies and more on the TechNet Security Center.

Software Updates
Managing software updates (patches) is an issue of critical importance to system administrators and IT managers. Microsoft offers a number of tools to help you manage and simplify the task of keeping systems up-to-date.

Guidance 

Recent Security Incidents

Security Updates 

Software Update Services

Microsoft Security Products
Learn how you can use Microsoft products and technologies to help your company enhance the security of its systems. Check out the TechNet Security Center for product- and technology-specific guidance that will help you protect your platforms, networks, desktops, and data. For a complete listing of Microsoft security products and technologies, visit the Product and Technology Security Center.

Microsoft Security Partners
Find partners with proven Security expertise.