Updating Records in a Form from Excel

Hi:

We need to update existing records in Creator from records in an Excel spreadsheet. We see how to do this using the Migration tool, but the problem is, we are on a Mac. Is there another way to accomplish this?

As presented from another post, here's the functionality we're looking for:

1. If the keys match, we would like to update/overwrite all the fields in the corresponding record using the Excel sheet data.

2. If the keys don't match, we would like it to create a new record and populate it with the fields in the Excel sheet.

Thanks,

Steve