I want to keep my email intact. I have retired and my work sub-account needs to be changed to my personal account to make sure I don't lose it.
And what happens if you leave Verizon because you move out of its service area? I know, unlikely, but it happens.
You can email your contact list from your old email account and merge with new account. Look for a sharing function in your work email contact list.
You can then forward your work email to while you transition your contacts to your new email address.
I Recommend switching to safe, public Gmail account. Unlike Yahoo, it isn't over-run with spam.
Gmail is free and will save all your contacts for use on any device. As a way to move your information, going through gmail is very effective.
You can use gmail as the default but still use Verizon email. This way your contact list is always saved in a public email account.