I realize that this isn't a WiX-specific question, but I figure someone here 
may have run into the same issue:

I've written a bootstrapper to install our msis, and am using MsiSetExternalUI 
to get  the status updates/progress for the bootstrapper's UI.  The problem is 
that when the installation fails or is canceled, it seems to stop sending 
messages to the external UI callback and so I have no way to tell how far along 
the rollback is, or even if it has completed.  Does anyone know of a good way 
to do this (either actually getting the rollback progress or simply telling 
when it is done)?

-Andy
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