Ok, my first cut at an Excel spreadsheet converter for Yahoo Contacts -> GPE Contacts is done and working. It manages to convert about 1000 of my personal and business contacts successfully from a couple of different Yahoo accounts, but consider it "beta" until a few other people have tested it. I stumbled across many, many minor problems and bugs that couldn't have been anticipated, so there are undoubtedly more yet to be found. The zipped spreadsheet file is attached to this message (I hope).

In the end I was pleased to see that the Categories from Yahoo Contacts are carried through to Categories in GPE Contacts, although GPE Contacts is painfully slow to filter by category. However GPE Contacts does not appear to recognize updated contact information by ID, so any updates will add a new contact rather than replacing an existing one. See my earlier instructions for removing the existing contacts file and re-creating an empty one if you get too much clutter.

A few more warnings:
- Don't attempt to import a vcf file over the network directly from GPE Contacts. There's some sort of bug between GPE Contacts and OS2008's network file access which prevents that from working. Copy the file to local memory on the N800 first.
- Don't edit the vcf file with the Notepad text editor on a Windows PC - it adds an invisible 3-byte UTF-8 header to the file which prevents GPE Contacts from reading it.
- Don't be surprised if GPE Contacts appears to freeze for a long time when you attempt to import a large vcf file - that's a good sign, as it usually comes back right away with "Failure" if there's a problem.