Thank you Captain, my Captain! I'm back on here to explain my outcome. IMAP and POP3 is NOT blocked by Verizon. For some reason, when I attempted the first dozen times to setup my IMAP email account via the S3's email setup (which starts out with an email address and password) the "Next" or "Manual Setup" button would not "click".... I'm not sure why, but after rebooting the phone the "Next" button worked - allowing me to go on and setup the custom user name (different from the email address) that my ISP uses as part of its nomenclature.
I missunderstood the "Verizon Corporate email" charge. This is a server service if you have no existing hosting account. WAY over priced.
All is well - and IMAP is working great on my S3. This phone simply rocks. From a previous iPhone user: Adios Apple! I've since rooted, unlocked the boot loader, and having a blast with this thing!