A.olm file is the data file used by Outlook for Mac to archive your email messages, contacts, calendar items, tasks, and notes. If you're moving from one Mac to another or upgrading from Outlook for Mac 2011 to Outlook 2016 for Mac or Outlook 2019 for Mac, export your email messages, contacts, calendar items, tasks, and notes to a.olm file first (How do I export to a.olm file? In Outlook 2016 for Mac and Outlook for Mac 2011, you cannot open a shared Calendar folder that is not a subcalendar of the user's shared default Calendar folder. For example, a user shares the following Calendar folders with you: Calendar; Second Calendar; Third Calendar; In this example, the Second Calendar folder is a subcalendar of the user.
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Original KB number: 2743766
Symptoms
When you have access to multiple shared Calendar folders, you cannot open one or more of the shared Calendar folders in Outlook 2016 for Mac or Outlook for Mac 2011.
Cause
In Outlook 2016 for Mac and Outlook for Mac 2011, you cannot open a shared Calendar folder that is not a subcalendar of the user's shared default Calendar folder.
For example, a user shares the following Calendar folders with you:
- Calendar
- Second Calendar
- Third Calendar
In this example, the Second Calendar folder is a subcalendar of the user's shared default Calendar folder. Therefore, you can open the Second Calendar folder in Outlook for Mac. However, the Third Calendar folder is not a subcalendar under the default Calendar folder. Therefore, you cannot open this folder in Outlook for Mac.
Resolution
Microsoft Outlook 2011 For Mac Not Opening
To resolve this issue, have the calendar owner create all shared calendars under the default Calendar folder.