Use the COPY command to create a new popstore account which
    duplicates an existing popstore account. Note that the new
    account will have its usage accounting fields set to zero (e.g.,
    last connect, total connect, past block days, etc.). Also,
    the new account will not have any stored messages, even if the
    account being duplicated has stored messages.

    If the username of the new account conflicts with an existing
    account, no new account is created and an error message is
    issued.

    See also the RENAME command.

                                   NOTE

       Your PMDF-POPSTORE license controls the number of popstore
       user accounts which you can have at any one time. When
       you reach this limit, you will not be allowed to create
       additional accounts without first deleting some accounts
       or obtaining a new license with an increased limit. Sites
       without a PMDF-POPSTORE license are allowed to use the
       popstore and create up to ten user accounts. This limit does
       not include the DEFAULT account. Use the SHOW/COUNT_USERS
       command to display the number of currently defined accounts
       as well as the limit allowed by your license.