WebIS mail has a feature that allows you to include a particular service when syncing. You could set named services (business/personal/etc.) on both the PC and Axim. Depending on what service, say Personal Mail, selected to be included, would be synced to the Personal Mail folder on the Axim. Free to try.
Software site: WebIS Mail
http://www.webis.net
Download windows installer (WMO2/WM03): WebIS Mail
http://download.pocketinformant.com/...Mail_Setup.exe
Download version WM02/WM03 cab file: WebIS Mail
http://download.pocketinformant.com/.../webismail.cab