Hi Greg,

>If the product is installed, is it possible to uninstall some, but not all 
>features?

During "Change" install (in Program and Features, former ARP) users can uncheck 
any of the installed features to uninstall them.  If no UI is involved, in 
command command line provide REMOVE property 
(http://msdn.microsoft.com/en-us/library/aa371194(VS.85).aspx) with comma 
delimited list of features to install.


>If the product is partially installed (some but not all features) is it 
>possible to "add" the remaining features without reinstalling the features 
>that are already installed?

Same, in UI users can select unchecked features to install them.  To install 
features from the command line (no UI), use ADDLOCAL 
(http://msdn.microsoft.com/en-us/library/aa367536(VS.85).aspx), ADDSOURCE 
(http://msdn.microsoft.com/en-us/library/aa367538(VS.85).aspx), ADDDEFAULT 
(http://msdn.microsoft.com/en-us/library/aa367518(VS.85).aspx), or ADVERTISE 
(http://msdn.microsoft.com/en-us/library/aa367547(VS.85).aspx) properties.


Hope this helps,

Alex Shevchuk


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