Recently created exchange calendar subfolder permission in mailbox does not update properly (intermittent occurrence).
Steps :
Create the subfolder in the mailbox using EWS Soap API.
Update the permission in the subfolder using EWS Soap API..
For Anonymous and Default user the permission is set to 'None' but for other user permissions are not getting updated/added though EWS API responding with the 'Success' response code
Check the recently created folder permissions in outlook.
This behavior is observed intermittently.