Outlook Calendar won't synch to Handheld

[Joan]

I have a Palm m515 using DataViz Beyond Contacts that
emulates Outlook. Until recently I have been able to
hotsync files without problems. Now everything but the
Calendar entries will sync. Have changed sync actions to
have desktop overwrite handheld etc. No error message in
sync logs. Have deleted the desktop Beyond Contacts folder
and reloaded. DataViz support has run out of ideas and
suspect a corrupt Outlook file. Run ultilities and
no 'corrupted' files are found. Any ideas?
Thanks