Microsoft has release free SEO tool or Search Engine Optimization Tool called SEO toolkit.

Microsoft SEO toolkit is free SEO tool to analyze and help to improve their Web site’s relevance in search results by recommending how to make the site content more search engine-friendly.
Using Microsoft SEO toolkit toolkit, you can:

• Optimize your website, for Bing, Google, Yahoo for and more!
• Increase Website Traffic and Revenue by analyzing your website and find ways to boost your number of hits. Use SEO recommendations to improve traffic and increase your revenue stream.
• Influence and Update Search Engines: Control the access and display of your content in search results. Keep search engines current with the latest information from your website.

There are three tools on Microsoft SEO toolkit namely: Site Analysis module, Robots Exclusion module, and Sitemaps and Site Indexes module.
A. The Site Analysis module
The Site Analysis module allows users to analyze local and external Web sites with the purpose of optimizing the site’s content, structure, and URLs for search engine crawlers.
B. The Robots Exclusion module
The Robots Exclusion module enables Web site owners to manage the robots.txt.
C. Sitemaps and Site Indexes module.
The Sitemaps and Site Indexes module enables Web site owners to manage the sitemap files and sitemap indexes on the site, application, and folder level to help keep search engines up to date.
So if you are a webmaster or blogger you must download this SEO tool, review your website, and make changes fast. The SEO Toolkit with its detailed analysis and search engine friendly suggestions helps improve the relevance of your website in search results right away. Visit Microsoft SEO Toolkit website or IIS.net to get more info about this SEO tool.