by Microsoft, although they appear to prefer not to post, and I can't divulge details of their login username or frequency for data protection reasons. Poweroid computers are here, and will in threads that relate to their company.
Other companies have registered with us, and no doubt keep an eye on things, but they don't post in response to threads about their products or services.
As we have said many times, we welcome manufacturers and vendors here, but it's up to them - we can't (and wouldn't want to) bully them into posting, any more than we would allow them to use the forum overtly as an advertising or publicity medium. There's nothing wrong with a company telling us how good their products and/or services are, but in has to be in context - we're not here to host "my computers are better than your computers" type threads or posts. That would (in my opinion anyway)tend to undermine the integrity of the forum.