Are you talking about Evolution to run on the Zaurus?? I don't think that it has been ported, but you might want to check the pdaXrom project, just to make sure.
Evolution should be available for nearly every desktop Linux distro. Depending on your distro & which package manager you use, it might be as easy as doing:
apt-get -install evolution
It is a fairly good MS Outlook work-alike without some of the fancier bells-and-whistles.
