I would like to keep an Outlook calendar synchonized with information
in a database using the iCal or vCal standard. The database contains
all the necessary information about summary, start-end times,
location, etc.

I have no problems creating files that can be imported into Outlook.
However, when I try to update an existing appointment (using REFRESH
method, UID, DTSTAMP, and SEQUENCE), the import ends up just creating
another appointment.

Does anyone have experience in this who can help.

Thanks,

Debi