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Microsoft to Block Exchange Online Access for Outdated Mobile Devices

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Microsoft will block mobile devices running outdated Exchange ActiveSync (EAS) versions below 16.1 from accessing Exchange Online starting March 1, 2026. This change affects devices using native email apps but not those using Outlook Mobile or on-premises Exchange Server installations. The update is part of Microsoft's effort to enhance security and compatibility, requiring devices to use EAS 16.1 or later. Popular email apps from Google and Samsung are being updated to support the newer protocol, while Apple's iOS Mail app already complies with the requirement. Microsoft has provided a PowerShell command for IT administrators to identify affected devices within their organizations.

Timeline

  1. 16.12.2025 14:53 1 articles · 4h ago

    Microsoft to Block Exchange Online Access for Outdated Mobile Devices

    Microsoft announced that it will block mobile devices running outdated Exchange ActiveSync (EAS) versions below 16.1 from accessing Exchange Online starting March 1, 2026. This change affects devices using native email apps but not those using Outlook Mobile or on-premises Exchange Server installations. The update is part of Microsoft's effort to enhance security and compatibility, requiring devices to use EAS 16.1 or later. Popular email apps from Google and Samsung are being updated to support the newer protocol, while Apple's iOS Mail app already complies with the requirement. Microsoft has provided a PowerShell command for IT administrators to identify affected devices within their organizations.

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