Still, they say "Our first priority is to help make this transition as easy as possible for you." and give two weeks?
I've backed up his Incredimail email database, and will have to find a way to import them into Thunderbird or something similar.
I moved my mom over from Incredimail to Thunderbird 10 years ago, but I don't think I managed to import the message history... Now she's on gmail instead of the internet provider email (that has since been switched several times), so no longer an issue