Ohhhhh, don't even getme started on that crappy program!! If you have any interest of every taking your messages out of Incredimail then you might as well buy the non-free version. As the free version is devoid of an export option for your messages and they store the messages in some DB format. Anywho, there is a utility out there on the net for exporting the messages but it's not for the faint of heart and it's fairly limited. Anyway, moral of the story is, don't use this just for it's so called skinning capabilities.
Consider this a public service message from someone who's had to rescue family members e-mail from this crppy little app.