1. find the "SMS Journal" program, developed for nokia 9210 users at:
http://www.karsten-seiferlin.de/html/sms_journal.html
2. backup with pcsuite all your 7650 data
3. start SMS Journal, go to "setup" and set the SMS folder: Usually C:\Nokia\Nokia 7650\backup\Internal\system\Mail
4. go to "SMS" then to the buttons on the right of the fake 9210 display, and click "import"
5. voila 😊 now you can hit "export" and choose your favorite format 😊