SymptomsWhen I back up all content of my webspace, the backup task freezes while saving mailboxes content.
CauseThe problem occures on Windows 2008 when Parallels Plesk Panel is installed with SmarterMail 5. In this case, one of native libraries (libmysql.dll) produces a deadlock while loading other libraries.
See http://bugs.mysql.com/bug.php?id=33031 for details.
The problem is fixed in libmysql.dll of versions higher than 5.0.70. To resolve the problem, replace libmysql.dll in %SystemRoot%\System32\ directory with the attached library.