Windows Plesk backend.

Webserver:

To switch Plesk Control Panel web provider you can use the following commands:
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IIS to Apache
"%plesk_bin%\reconfigurator.exe" --switch-plesk-web-server --new-provider=apache

Apache to IIS
"%plesk_bin%\reconfigurator.exe" --switch-plesk-web-server --new-provider=iis

To install hosting for a domain
websrvmng.exe --install-vhost --vhost-name=

To remove hosting for a domain
websrvmng.exe --remove-vhost --vhost-name=

To reconfigure hosting for a domain
websrvmng.exe --reconfigure-vhost --vhost-name=

To reconfigure a subdomain
websrvmng.exe --update-subdomain --vhost-name= --subdomain=

Passwords for system user and IIS user can be unsynchronized or synchronised using
websrvmng.exe --update-anon-password --domain-name=

To reconfigure webmail
websrvmng.exe --reconfigure-webmail
defpackagemng.exe" --fix --type=webmail

Re-configure FTP configuration

For a particular domain.
"%plesk_bin%\ftpmng.exe" --remove-vhost --vhost-name=yourdomain.com
"%plesk_bin%\ftpmng.exe" --reconfigure-vhost --vhost-name=yourdomain.com

For all domains in the server.
"%plesk_bin%\ftpmng.exe" --remove-all
"%plesk_bin%\ftpmng.exe" --reconfigure-all