We are a mixed Windows and Mac environment.  I have a user who has created a sub folder - calendar which she has shared.  The people who are using Outlook 2010 on Windows can access the shared calendar just fine.  Users running Outlook 2011 on Macs cannot access the shared calendar.  The sharing invitation includes an xml attachment that Outlook 2011 cannot process.  Any suggestions for getting access to this shared sub folder calendar would be appreciated.

Thanks!