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solution
I was with the same problem. The problems occurs because the plesk database do not match with the os setups.
To solve you need to add manualy all plesk database entrys in system. Sample : if you have 3 mailbox in plesk you need to see if it exists in mailserver, same to iis, dns,...
After all setups are the same in pleks database and system the deletion will work.
In my case i only add manualy 2 pop aconts that was in plesk and did not was in mailenable that the delete work.