[mathiass]

Wirelessly posted (Opera/9.5 (Microsoft Windows; PPC; Opera Mobi/17518; U; en))

it has to do with the individual calendars I believe. you can only sync one calendar with active sync, and that one calendar is your personal one. this is my observation and conclusion based on what I've read in the google mobile support areas.

if anyone has any better info please do share as I'd love to sync up other google calendars as well