i am going to see if it will run on windows 8
have you got a link to download it from ?
you can if you want post it on www.wikisend.com and copy and paste the download url in here
But your solution may be windows live essentials which is the replacement for the calendar that was dropped in windows 7. presumably it would be able to import the old calendar files but with microsoft nothing is really for sure. I cant find anything definitive about whether it can or not.