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Remove User from Global Address List

Source: _imported/Remove user from Global Address List.txt · Applies to: Active Directory / Exchange hybrid environments · Last reviewed: 2026-07

Purpose

Hide a departed user from the Exchange Global Address List (GAL) so they no longer appear in Outlook address books across the organization.

Prerequisites

  • Active Directory Users & Computers (ADUC) with Attribute Editor tab enabled
  • Exchange Admin Center access (to verify)
  • Azure AD Connect / Delta Sync access

Steps

  1. Open Active Directory Users & Computers and locate the user object.
  2. On the General tab, clear or overwrite the E-mail field with a placeholder (e.g., <hidden-<username>@<domain>.com>).
  3. Open the Attribute Editor tab.
  4. Find msExchHideFromAddressLists and set it to TRUE.
  5. Click OK to apply changes.
  6. Run a Delta Sync from the Azure AD Connect server.
  7. Check Exchange Admin Center — the user should now show as hidden from the GAL.

If the user still appears (shows "NO" in Exchange Admin Center)

  1. Return to the user's Attribute Editor in ADUC.
  2. Locate the mailNickname attribute and fill it in manually if it is blank.
  3. Click OK and run another Delta Sync.
  4. Verify again in Exchange Admin Center.

Notes / Gotchas

  • The mailNickname step is a known workaround for cases where the hide flag alone does not propagate. Always try it if the first sync does not take effect.
  • GAL changes may take up to 24 hours to propagate to all Outlook clients after Exchange reflects the change.
  • This procedure hides the user from the GAL but does not disable or delete the account. Pair with the User Offboarding Checklist for full termination.