The following built-in scheduled tasks on Plesk for Windows are set byd default to Notify = Every time. Every clean install of Plesk will send daily two annoying e-mail messages to the administrator. It will be more useful to change that default to Notify = Errors only.

Daily web statistics analyzers run task:
C:\Program Files (x86)\Parallels\Plesk\admin\bin\webstatisticsexecutor.exe

Daily script task:
C:\Program Files (x86)\Parallels\Plesk\admin\bin\php.exe -q "C:\Program Files (x86)\Parallels\Plesk\admin\plib\DailyMaintainance\script.php"