Finally Microsoft may be touching the main stream of professional web development IDE. Microsoft is going to lunch a new software suite titled “Microsoft Expression” which contains three softwares. Web Designer, Interactive Designer & Graphic Designer.
Expression Web Designer is a great tool which can be compared market ruling Macromedia Dreamweaver (Now Adobe Dreamweaver).
Previously microsoft did not get any suitable position in this market with its FrontPage. But this software has many great features for professional development.
The main drawback of this software is that still it does not support PHP. So you have to rely on other php IDE for coding in PHP.
This software can be download free (Preview version) from here