Windows Installer version 5.0 is included in Windows 7 Beta. The MSDN documentation section "What's new in Windows Installer 5.0" has been updated accordingly and available for online viewing. In addition, all functionality provided with the MSI 4.5 redistributable release is included on Windows 7. Over the next few days, we will do a series of deep dive posts on some of the newly added feature areas. So please use the comments to let us know your thoughts and questions.
I also encourage you to take a look at the scenarios published at http://input.microsoft.com and provide your feedback. The Application Setup related scenarios are under Setup and Deployment section.
[Author: Zainab Hakim]
This posting is provided "AS IS" with no warranties, and confers no rights. Use of included script samples are subject to the terms specified at http://www.microsoft.com/info/cpyright.htm.