My company uses Microsoft Hosted Exchange (aka office 365). We use several shared calendars to coordinate our ever-changing schedules. Up until a month ago there were no issues.
Our problem is that we are having trouble deleteting items using Outlook 2010 desktop application. A user with editor access (so read, write) will delete an appointment and it will come right back during the next sync. The owner of the calendar does not have problems deleting events ever, Just users with shared access. I have even tried giving a shared user 'owner' access and it still does not resovle the issue.
Steps I have already taken:
1. redo permissions (remove and put back) , no change
2. tried different computers
3. removed outlook profile from computer and repopulated
I turned on debugging and found the following errors but after searching I cannot find how to trouble-shoot them: please see attachment image