Action Required: Upgrade ExchangeOnlineManagement PowerShell Module to Version 3.10.1 or Later

🚨 The Signal: Exchange Online PowerShell module 3.10.1+ introduces enhanced authentication to counter emerging threats. Older versions will fail authentication after March 2027, requiring an upgrade to maintain administrative access and security.

The Impact

Admins using outdated Exchange Online PowerShell modules face authentication failures, posing a significant security risk to management capabilities.

• Admins using PowerShell 7 with WAM disabled will lose Exchange Online access.
• Automated scripts relying on older modules will cease to function.
• Organisations not upgrading risk unmanaged Exchange Online environments.
• Security teams face increased risk from unpatched administrative tools.

The Action

1. Identify all systems running ExchangeOnlineManagement module versions older than 3.10.1.
2. Upgrade affected installations to version 3.10.1 or later using `Update-Module -Name ExchangeOnlineManagement`.
3. Validate all administrative scripts and automation solutions after upgrading.
4. Ensure ongoing module updates are part of standard patching procedures.

Domain: Exchange · Impact: high · Workload: Exchange Online · Essential Eight: Patch Applications · ISM: ISM-0304, ISM-1690, ISM-1691, ISM-1692, ISM-1693, ISM-1698, ISM-1699, ISM-1700, ISM-1704, ISM-1807, ISM-1808, ISM-1876, ISM-1901, ISM-1905