This:

http://cobb.uk.net/770/index.html#opensync

Suggests you can sync contacts over bluetooth with a mobile phone, if this is the case (it looks a bit beyond me) and your phone was in sync with Outlook it could be possible, assuming I have understood the article correctly.

Edit: also a sync method being worked on here (not ready yet).
http://www.pimlico-project.org/

I also found this which claims to work too.
http://www.cleardefinition.com/page/...d_GPE_on_N800/