Have you checked Palm's support forums? It is a Palm problem with Outlook.

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Milly Staples [MVP - Outlook]
Post all replies to the group to keep the discussion intact. Due to
the (insert latest virus name here) virus, all mail sent to my personal
account will be deleted without reading.

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After searching google.groups.com and finding no answer, Charles asked:
| I've been hotsyncing PDA to desktops without problem at
| home and at office until I upgraded my Palm, reinstalled
[quoted text clipped - 11 lines]
| Outlook Contacts synchronization failed
| Conduit 'Outlook Contacts' Error: Unknown error. (FFFF)