nymojoak,

- Solution under development for S60: SBSH Calendar <-> Funambol
- Solution under development for Maemo: Use existing Maemo PIM apps that support categories but are limited in functionality and UI optimization. Syncing with Outlook would involve a funny mix of Funambol and SyncEvolution.

As far as 1-1 multiple calendar syncing - I asked a question about how to sync a task/event from Outlook into a particular calendar on N900 which noone answered yet...

To Nokia: Bad things happen when you hire a plumber to fix your ferrari.