How to switch Plesk control panel from one webserver to another?
Launch command prompt.
Start >> Run >> cmd
If IIS is used as Plesk web server switch it to Apache
%plesk_bin%\reconfigurator.exe –switch-plesk-web-server –new-provider=apache
If Apache is used as Plesk web server switch it to IIS
%plesk_bin%\reconfigurator.exe –switch-plesk-web-server –new-provider=iis