Miss. Code § 21-8-35
The territorial limits of any such municipality shall remain the same as under its former organization and any litigation concerning annexation in progress at the time any municipality shall adopt the mayor-council form of government shall not be affected by such change; provided that nothing herein shall affect the rights of such municipality to expand its territorial limits as provided by law. All rights and property of every description which were vested in every such municipality under its former organization shall vest in the same under the organization contemplated by the mayor-council form of government; and no right or liability, either in favor of or against such municipality, and no suit or prosecution of any kind shall be affected by such change. This chapter shall not in any manner, irrespective of other provisions hereof, affect the organization of the police court or of the public schools which shall continue to operate by and under the laws otherwise applicable. The police justice, as well as all other municipal employees, shall be appointed by the mayor.
Miss. Code § 21-8-35