Mind that "free" doesn't quite exists here; companies would need to administrer those (not so offline) solutions. And it's unlikely that all small business will suddently hire IT guys for that. So what's the alternative? Back to small unmaintained servers under the office desk configured by the owner's cousin and never maintained? In these times it's going to be a shit-show given how more intense vulnerabilities or miss configurations are exploited... From my point of vue there's no good solution here.