Add email alias to multiple O365 user accounts in bulk

Our email address are firstname . Lastname @ olddomain Here is how I updated all of our email addresses.

get-aduser -Filter * | select samaccountname | Export-csv adusers.csv

Edit adusers.csv - Remove service accounts, etc and all accounts that should not be changed. Save.

Copy final list and put it in a text file - adusers.txt

Copy adusers.txt to Powershell folder

$adusers = get-contect adusers.txt

check $adusers - This should reflect the final list created in the csv file.

$adusers | Get-ADUser | ForEach-Object { Set-ADUser -EmailAddress ($_.givenName + '.' + $_.surna me + '@newdomain') -Identity $_ }

Get-ADUser -Properties * -Filter * | select name,samaccountname,emailaddress to check the results.