Convert Eudora 6.2 on Apple to 2011 Outlook on Apple
According to this post (Whats the last OS X that supported Power PC?) Power PCs can only use up to 10.5, which is 7 versions prior to the current, and likely not worth attempting to upgrade.   

Also, since this OS came out in 2007, it likely does not support modern versions of Outlook (such as 2011), though I did not confirm this.    

TL;DR - computer is really too old for any upgrades that you are looking for.   Sorry :(