I finally got it working; syncing the Nokia 6300 with my Google Calendar account.
The trick was to ues the gnokii plugin for opensync instead of trying to get the SyncML bit working (this was not obvious becaues a lot of othre Nokias are synced with the SyncML plugin and the phone itself reports that it supports it).
I’ve described how I set it up here: syncing_nokia_6300_with_google_calendar
where do i download the gui interface program, the http://www.in.fh-merseburg.de/~jahn/opensync-0.21/ etch mainn
website above is not working
It can help…
The key
#gpg –keyserver hkp://subkeys.pgp.net/ –recv-keys CB210090B029CB84
#gpg –export CB210090B029CB84 | sudo apt-key add -
for /etc/apt/sources.list
deb http://opensync.gforge.punktart.de/repo/opensync-0.21/ sid main
deb-src http://opensync.gforge.punktart.de/repo/opensync-0.21/ sid main
And thx Skybert for your post!