188.8.131.52 Updating Folder Permissions
To update an existing entry in the folder's permissions list, the client MUST retrieve the existing permissions list as specified in section 184.108.40.206 to get the values of the PidTagMemberId properties that are assigned to the users in the permissions list.
The client MUST send a RopModifyPermissions ROP request ([MS-OXCROPS] section 220.127.116.11) with the ModifyRow flag set in each PermissionData structure that specifies a user to be modified. The PropertyValues field of the PermissionData structure MUST include the following properties:
The PropertyValues field MUST NOT include the PidTagEntryId property (section 2.2.4).