Software Deployment

While I was creating a package to install Adobe reader 7 with all updates and uninstall previous versions I've found that Reader 7 does not uninstall 6.x. One of threads in this forum suggests configuring upgrade relationships with Upgrade table and SecureCustomProperties. Looking at 7.0 msi package with Orca I've noticed that 6.x versions in Upgrade table have ActionProperty values 'RDRBIG_6' and 'RDRMIN_6' while SecureCustomProperties value in Property tab lists them as 'RDR_BIG_6' and 'RDR_MIN_6'. As soon as I added correct values Reader 7 starts to uninstall 6.x during setup.

Just wonder if it is intentional or a bug in msi package. I'm new to msi authoring so I might also miss something here...