4.1. Plesk 7.5.5 build 051007.11 for Windows
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 1. [+] Merak 8.2.x support added
 2.[*] Migration problems fixed (components determining, lack of memory while restoring sites)
 3. [+] Feature Interface Management added
 4. [+] SWsoft SiteBuilder 1.2.0 for Windows support added
 5. [+] Additional controls for managing permissions of system users added, along with controlling inheritance of permissions for folders and files
 6. [+] Added ability to set up maximum size of mail message that spam filter should check.
 7.[*] SmarterMail problems solved (switching to SmarterMail from another mail server in case some domain has mailbox admin@, managing mail aliases, configuring SMTP Authorization)
 8.[*] Installer problems solved (connected with displaying of non-installed components)
 9.[*] Backup/restore problems solved (subdomain configuring, FTP backup, different policies of placing domains to IIS Application Pools, permissions for folders published by ASP.NET Web Applications)
10.[*] Auto Updater configuration problems solved 
11.[*] Plesk Reconfigurator problems solved (root directory permissions checking, changing location of mailboxes and domain folders)
12.[*] Web Directories Management Problems solved (displaying users and their permissions)
13. [+] Now it is possible to remove non-existent IP addresses from Plesk for VzWin 
14. [+] Now it is possible to send bug report about unhandled errors 
15. [+] Game Servers now can work with MySQL DBMS
16. [+] Added ability to set up maximum number of mail messages filtered by SpamAssassin simultaneously
17. [+] Added ability to restore IP addresses configuration after changing network adapter or renaming network interface.
18.[*] Virus scanning for Merak mail server via other antivirus servers is improved
19. [+] Now Reconfigurator sends report about domains checking as an attachment 
20. [+] Now it is possible to use URLs with spaces in Custom Errors 
21.[*] Many scheduler problems fixed 
22. [+] In Dr.Web evaluation mode, the number of checked e-mail addresses was increased from 15 to 30 
23. [-] Problem of managing several Acronis partitions eliminated
24. [-] Problem with adding ASP.NET web application after renaming of server, 
25. [-] Problem with adding contact to Horde address book solved
26. [-] Problem with big size database backup solved 
27. [-] Problem with logging in with domain user or mail user account solved 
28. [-] Now it is not possible to control Plesk SQL Server service from control panel 
29. [-] Problem with setting incorrect password for IIS Internet user solved 
30. [-] URLs are now protected independently of their case (lowercase, uppercase) 
31. [-] Installing DrWeb key problem solved.
32. [-] Problem with cookies while previewing site solved.
33. [-] Solved problem with logging in to control panel with domain user login longer than 50 characters.
34. [-] Problem with setting up default mailbox quota solved.
35. [-] Problem with showing state of ODBC DSN connection solved.
36. [-] Problem with LF in MailEnable autoresponders solved.
37. [-] Configuring ColdFusion 5 problem solved.
37. [-] Solved problem with publishing DNN and CS when a connection to remote Microsoft SQL Server is configured.
39. [-] Problem with TAB symbols while adding/changing ODBC DSN connection solved.
40. [-] Problem with creating IDN domain using domain template solved.
41. [-] Solved problem with wrong protecting URLs, which names contain name of protected URL.
42. [-] Problem with installing control panel SSL certificate solved.
43. [-] Problem with resetting Plesk key to default solved.
44. [-] Problem with sending processed logs via e-mail solved 
45.[*] Now the RDP button is disabled only for domain user and in case it does not have Shell Access permission 
46. [-] Problem with restarting server using the Server > Reboot button solved
47. [-] Problem with managing permissions of system user Everyone on Plesk domains solved