I am trying to create a minor upgrade for an existing product that will be 
delivered as a patch. However, I want any previous service packs to be removed 
before the new one is applied.
I have also read that running CA's during the uninstall don't work is there a 
work around for this since my uninstall sequence does rely on CA's?

Scenario:
                RTM release ver 1.0.0
                SP1 ver 1.0.1 (Delivered as a minor upgrade patch {.msp})
                SP2 ver 1.0.2 (Also delivered as a minor upgrade patch {.msp} 
but remove SP1 if it exists before applying)
                SP3 ver 1.0.3 (Also delivered as a minor upgrade patch {.msp} 
but remove SP1 or SP2 if one exists before applying)


Also what is the difference between the following command lines to install the 
patch and which is preferred?

1)      Msiexec /p <patchfile>

2)      Msiexec /update <patchfile> REINSTALL=ALL REINSTALLMODE=vomus

Thanks - Tom
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