Tiger (Server) isn't officially supported (search on Google for unofficial methods - which however might not work anymore - to install it in a virtual machine).
Classic (Mac OS 9) cannot be run on Fusion, as it isn't an Intel OS (it's PowerPC); but you can run it with this program:
http://www.emaculation.com/doku.php/sheepshaver
... which, despite the weird name, seems to work quite well and is also actively maintained by its community (even if perhaps it isn't particularly easy to set up).