I'm looking for a company that offers support contracts for web hosts, not my end clients. Are there any professional support companies (i.e. an experienced company with phone contact and a decent web site) that support Plesk?

BTW I've received an unsolicited email from such a company (I believe it was called PSA something based in Germany) a few weeks ago but I must have deleted it. Any suggestions?

Are you talking about something like http://BoxAdmin.com?