I receive email through Verizon and Optimum, using four laptops and a cellphone.  How many “accounts” does eM Client regard this as, and what would be my total price?

Hi Danny,
the account limit is related to the email addresses you set up inside eM Client.
eM Client is a Windows desktop application, so it would only apply to your computers which run Windows OS.
You will need a license for each computer - which might sound like a lot, but the price for each one goes down starting with the second license already - you can check out the price calculator on our website.