As a consultant, I see several companies that use a Microsoft Windows server and that are currently under cyber attack. looking at the userids that they use to try to get in, I think that somewhere there must be a list of existing userids (and passwords and even PC names) that they can use to login to a domain. Would be useful to get that info in hibp. By the way, on checking the domain names in hibp, I never get a verification code sent to security@....