Unable To Delete Calendar In Outlook 2025 App. Any calendar you’ve created in outlook can be deleted except the primary outlook calendar, which is used to keep track of meeting requests that you send and accept as. If the issue persists, update and repair office.

To do this, log in to owa and open the calendar. Today, i did an uninstall of office 365 (and the default mail app) using add or remove programs and then manually deleted the related folders in.