It is not possible to change the MessageClass or create a message with another MessageClass

It is not possible to change the MessageClass or create a message with another MessageClass
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 Jan 12 2022
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It is not possible to change the MessageClass or create a message with another MessageClass like IPM.Post

 

When I do it via SingleValueExtendedProperties =  "Id ='String 0x0001A' Value='IPM.Post'" 

I am getting the error "Operation would change object type, which is not permitted."

 

In EWS it was possible when creating a new item.