Is it a Pc Pocket 2003? There is a patch to sync with this version of Pc Pocket with Easy Sync Pro 4.2.1.
See
http://www-1.ibm.com/support/docview.wss?rs=465&context=SSKTPA&q=pocketpc+2003&uid=swg24005654&loc=en_US&cs=utf-8&lang=en+en
I hope that it can help you