Uninstallable Patches that are not Uninstallable

posted by  techgeek (12)  15 months ago (blogs.msdn.com)

Patching with Windows Installer is the act of applying a pair of transforms in a patch to a Windows Installer product, then repairing that product. Any changes made in the transforms affect the aggregate view that Windows Installer reinstalls. This is displayed in the diagram below, where the bottom layer is the components in the product MSI, the second layer is the changed components in the patch transforms, and the top layer is the aggregate view created by transforming the product.