PHP
Windows Server is a very viable platform for building web applications using PHP. Over the past few months there have been a number of improvements for PHP development on Windows and below are some of the resources that you may be interested in knowing about:

ASP.NET is a leading web development platform for building solutions on the internet. It has full integration in Microsoft's development tools, including Visual Studio, Visual Studio Express, Expression Studio and others.

AJAX is an application of JavaScript on the browser to create a more interactive experience for web users. Microsoft has a number of powerful tools available to provide you with the ability to create very interactive applications using AJAX, including a freely downloadable AJAX toolset for Visual Studio.

As new technologies become available for web-based development, we have seen an exponential jump in the usability of web-based applications as they are becoming as rich, if not richer than desktop applications. The following links provide you with some resources to build rich, interactive application on the web:

Microsoft® Office SharePoint® Online is a collection of Web-based tools and technologies built on Microsoft Office SharePoint Server 2007 that help you store, share, and manage digital information within your company. This white paper describes the customization (or extensibility) capabilities that are supported with the Standard offering of SharePoint Online. Click Here.

Depending on your area of expertise, and your business focus/objectives, Microsoft has many offerings to help you build cutting edge, scalable and reliable websites and web applications for your customers. Click on each icon to Get Started!