Yes, It can be used 
For one person 
For use on multiple PCs/Macs, tablets, and phones (including Windows, iOS, and Android*)

Yes. Please note that Business Essentials & Business Premium Plans are designed for businesses that require fewer than 300 accounts. If your organization is larger than 300 employees, you can opt for E3 & E5 plans. If you have questions, just give us a call . Our award-winning team is here to help 24/7