Added Files

Powershell/PowerShell-Office365Admin/ExchangeWithMFA/AddGuestsToGAL.ps1

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+# Bulk change guest accounts from a certain domain so that they show in the Global Address List
+#
+# Uses the new PowerShell "module" that support MFA.
+#
+
+# What domain are the guests email addresses from?
+$guestDomain = ''
+
+# Find and load the new ExO "module"
+$exoModulePath = (Get-ChildItem -Path $env:userprofile -Filter CreateExoPSSession.ps1 -Recurse -Force -ErrorAction SilentlyContinue).DirectoryName[-1]
+. "$exoModulePath\CreateExoPSSession.ps1"
+
+# Establish a session to Exchange Online
+Connect-EXOPSSession
+
+# Find all the relevant users and enable them to show in the address list
+Get-MailUser -ResultSize Unlimited | Where-Object {$_.RecipientTypeDetails -eq 'GuestMailUser' -and $_.EmailAddresses -match $guestDomain} | Set-MailUser -HiddenFromAddressListsEnabled $false
+
+# End the Exchange Session
+Get-PSSession | Where-Object {$_.ComputerName -eq 'outlook.office365.com'} | Remove-PSSession