Hi Jose,
I notice you replied to the thread
http://community.office365.com/themes/groups/generic/forums/thread.aspx?ForumID=153&ForumThreadID=291256&GroupKeys=en-us/ and have similar issue. And I would like to collect some more information to better understand your situation:
1.The detailed version of your system.
2.The detailed version of your Outlook for Mac.
3.Regarding the error message “To see this event, you'll need Editor or higher permissions for this shared calendar”, could you confirm what permission has been assigned to them? If you are not an Office 365 global admin, please contact your admin to confirm about this. Moreover, if he assigns you a higher permission like owner, will the issue persist?
4.Does the issue affect any other users if they add the shared calendar?
5.Does the issue occur on Outlook 2010/2013 or Outlook Web App?
Thanks for the details.
Best Regards,
Alex