The following improvements have been made:

[*] Security improvements. (PPPM-1636)
[*] Ukrainian locale was updated.

The following issues have been resolved:

[-] The SuspendHandlerRunner.php script did not suspend domains.
[-] Wrong dates were set in email messages after migration or restoration of backups on servers with SmarterMail. (PPPM-1189)
[-] (Linux) Mailbox quota was periodically reset to unlimited. (PPPM-1603)
[-] (Linux) Disk usage statistics for primary domains showed zeroes if there were addon domains. (PPPM-1493)
[-] (Windows) Unable to migrate mail messages from Plesk 8.x to Plesk 11.5. (PPPM-1643)
[-] (Windows) Daily registry backup was not in Windows Registry format.
[-] (Windows) Users were unable to remove mailboxes if a local MySQL server was added by IP address, not by localhost. (PPPM-988)