Up until now, Microsoft Security Essentials was only licensed for personal and home office computers, but now Microsoft is loosening up the restrictions to allow commercial use for up to 10 small business machines.
[W]e are extremely excited today to let you know that Microsoft is making its Microsoft Security Essentials available to small businesses on up to 10 PCs for FREE, beginning in early October! By providing Microsoft Security Essentials to small businesses free of charge, Microsoft extends its commitment to help these companies save money and grow their business by offering no-cost protection from viruses, spyware and other malicious threats.
This is great news for small businesses as now MSE is the only major player which has a free version of their product available for commercial use (to my knowledge).
While there is nothing really stopping you from installing it on as many machines as you want, it is especially important for commercial users to stay within the bounds of software licenses because the penalties can be hefty if violations are found. Making the switch from your existing anti-virus package to MSE could save several hundred per year. Every little bit helps.
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