Hide Public Folders in GAL (Global Address List)

The following walkthrough will hide public folders and sub folders from the GAL.  The attribute can also be modified from ADSI directly without using PowerShell.

PowerShell Script: This script will connect to exchange online and hide all public folders from the GAL

UserCredential = Get-Credential

$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/https://protect-au.mimecast.com/s/rgAtCxnMKyUR2A7nf8tg5L?domain=outlook.office365.com -Credential $UserCredential -Authentication Basic -AllowRedirection

Import-PSSession $Session -DisableNameChecking

Get-MailPublicFolder | Set-MailPublicFolder -HiddenFromAddressListsEnabled $True

ADSI: This will allow you to select specific users/groups/OU’s/public folders/etc. from active directory to hide from the GAL.

• Open ADSI Edit
• Right-click and the object you want to edit
  • Select properties
• Look for the attribute called “msExchHideFromAddressLists”
• Change this value to “TRUE” to hide from the GAL