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Is iCAL support active in the Office365 beta; I know it's supposed to work with Exchange 2010 SP1, but wasn't sure if the beta was allowing it, or if even production Office365 was going to allow it, I hope so, got a lot of Thunderbird users who would benefilt from it.
Based on the docs I have, this is present.
"Calendar Sharing through iCal
Exchange Online allows users to publish their calendars using the iCal format for anonymous access by other users. Users can also subscribe to calendars that others have published to Internet locations through iCal. This personal calendar sharing is different than federated calendar sharing, which is configured by an administrator and provides organization-to-organization free/busy sharing. Administrators can disable iCal publishing and iCal subscriptions for users in an organization through Remote PowerShell."