Functions for putting FrontEnd and Mediation servers in and out of Maintenance mode
Install-Module -Name vtfk.SkypeMaintenanceMode
Start-MaintenanceMode -ComputerName "Select-From-List"
Stop-MediationMaintenance -ComputerName "Select-From-List"
Start-FrontEndMaintenance -ComputerName "Select-From-List"
Stop-FrontEndMaintenance -ComputerName "Select-From-List"
Automatically retrieves and works on the FrontEndPool which has the CentralManagement service