Let's call that a dead end. I won't discuss why it's dead end since it's a waste of time.

-> Let's ask this. Let's say I wanted to use Windows Mail and have two accounts for the mail.

Step 1. Create a new account on the Windows PC.

Let's say the first account is Greg, the second account is Marsha.

Step 2. Log in as Greg and setup Greg's email. Log out of Windows.

Step 3. Log in as Marsha and setup Marsha's email. Log out of Windows.

There, we're done.