Microsoft has started offering SEO services through its partners program. According to Microsoft survey.

According to an April 2007 study*, 84 percent of technology buyers begin their online search with one of the major search engines. So it’s more important than ever to make sure your company appears on the first page of search results. Find out how the Microsoft ISV Search Engine Optimization (SEO) Service can provide you objective analysis and tools to help you improve your site’s ranking on search-results pages and ensure that customers find your solutions ahead of those of your competitors.

These are quoted from Microsoft partners website:

Improve your search-engine rankings and start attracting more sales leads to your company’s website. Contact Microsoft today to request details on how to sign up.

Paid search works well for generating lots of website impressions, but appearing in free search-engine results builds more credibility with prospective customers. The Microsoft ISV SEO Service is a cost-effective marketing solution that can help you appear more prominently in free search results on the major search engines. And thus help you attract more prospective customers. The service can also help you improve your site’s content so that it better converts visitors to sales or sales leads.

If you are interested, than you can start from here:

https://partner.microsoft.com/40046001