PowerShell script to change UN Email mailnickname via CSV

I can't take credit for this, but in case anyone else needs it.

#Connect to MSOLService with administrator at the console to provide credentials
#Script will iterate through a CSV that contains OldUPN and NewUPN column headers
#Set-MsolUserPrincipalName will change the UPN, the Email address, and mailNickname fields as requested

Connect-Msolservice

#Import CSV
$ImportPath = Read-Host "Enter the path for the CSV, please ensure it has columns with headers named OldUPN and NewUpn with no spaces"
$ImportFile = Import-CSV -Path "$ImportPath" -Delimiter ","

#Iterate through the CSV
foreach ($Import in $ImportFile) {
$OldName = $import.OldUPN
$NewName = $import.NewUPN
Write-Host "Changing UPN value from $($OldName) to $($NewName)" -ForegroundColor Yellow
Set-MsolUserPrincipalName -UserPrincipalName "$OldName" -NewUserPrincipalName "$NewName"
}