I used Adobe Customization Wizard to create a transform file for Adobe Reader 9. The reason is that if you try to upgrade Adobe Reader 9.1 or 9.2 clients with the MSI of 9.3.3, it says the product is already installed.
However if you call the MSI with a transform that enables updating (in the transform file) then it's supposed to work.
I cannot seem to call the MSI with the transform in a vbscript or batch command though for some reason.
The MSI and transform file are on a \\network share in the same folder.