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Install Outlook application

Download MFC MAPI - https://archive.codeplex.com/?p=mfcmapi – Click on April 2017 Release Open – Session- Logon- Select the Outlook profile for the user

Navigate to “Root Container” \ “To-Do Search”. There may be multiple “To-Do Search” folders, with names like “To-Do Search2”, 3, etc. Repeat the following for each:

Find the property PR_CONTAINER_CLASS. For a mailbox in repro, it may be “IPF.Note” which is incorrect and needs to be changed.

Double-click on PR_CONTAINER_CLASS and change this to “IPF.Task” and click “OK”