More than 35,000 startups are enrolled in Microsoft BizSpark (http://www.bizspark.com/About/Pages/Overview.aspx). Some of them are likely to be interested in web-hosting with simplified deployment. Also, Microsoft is building a PaaS (Windows Azure: http://www.microsoft.com/windowsazure/) which suggests that they think there is a market.
Disclaimer, I'm an AppHarbor co-founder.