The modern concept of small office/home office, or SoHo, refers to the category of business, which involves from 1 to 10 workers. SOHO can also stand for small or home office or single office/home office. A larger business enterprise, one notch up the size scale, is often categorized as a small business. When a company reaches 100 or more employees, it is often referred to as a Small and Medium-sized Enterprise (SME).
This can seriously inconvenience SOHO users who wish to run their own mail servers on residential ISP connections or local MTAs on laptops for example.