If we want to purchase more user licenses at a later date, is this possible?

Detail

Yes, When you purchase one or more WorkgroupMail licenses, we send you a keycode to unlock the software for that number of users. If you want to purchase additional user licenses in the future, you simply enter your existing keycode into the purchase form. We then know how many user licenses you already have and know to add the number of users you purchase to your existing user count. We then send you back a new keycode which will enable these users.