The following error occurs when attempting to open MailEnable Management:
CONFIG_TEXT: MMC: could not create a snap-in
CONFIG_TEXT: MMC: Cannot initialize snap-in
Connect to the server via RDP;
Execute the following command from the command-line:
Select File > Add/Remove Snap-In, select MailEnable Management, click Add and then Ok.
Save the file as MailEnableadmin.msc.
Create a backup of the original
%plesk_dir%Mail Servers\Mail Enable\AdminMailEnableadmin.mscfile and replace it with the one from step 4.