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Powershell/PowerShell-Office365Admin/MSOnline/BulkChangeOnlineUserUPN.ps1

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+# Bulk update Online User UPNs
+#
+
+# What domain are we replacing?
+$oldDomain = ''
+
+# What are we replacing it with?
+$newDomain = ''
+
+# Import the MSOnline module and connect
+Import-Module MSOnline
+Connect-MsolService
+
+# Get all users using that domain as their UPN
+$users = Get-MsolUser -All | Where-Object {$_.UserPrincipalName -match $oldDomain}
+
+# Run through the users replacing their UPN and keeping us updated on what's going on
+foreach ($user in $users) {
+    $newUPN = $user.UserPrincipalName.Split('@')[0] + '@' + $newDomain
+    Write-Output -InputObject ('Setting UPN for user ' + $user.UserPrincipalName + ' to ' + $newUPN)
+    Set-MsolUserPrincipalName -UserPrincipalName $user.UserPrincipalName -NewUserPrincipalName $newUPN
+}