After quite some build-system related difficulties, we have finally succeeded building Sunbird 1.0b1rc1. Please download and test it within the next 2 weeks, if no critical errors show up this will afterwards become the final version 1.0b1.
Candidate builds for Sunbrid 1.0 beta1 in 37 languages are available as of now for:
A corresponding build of the Google Calendar Provider is available at addons.mozilla.org
Please tell us what you think of these candidate builds and file bugs in Bugzilla as you go.