(Updated) Trust DigiCert Global Root G2 certificate authority to avoid Exchange Online email disruption [MC1224565]
Posted inExchange Online

(Updated) Trust DigiCert Global Root G2 certificate authority to avoid Exchange Online email disruption [MC1224565]

Message ID: MC1224565 (Updated) Updated March 16, 2026: We republished the Microsoft 365 Root Certificate Chain Bundles for Worldwide (WWMT) and GCC High / DoD (ITAR) after identifying that the previously published bundles were missing required information. If you already…
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(Updated) Trust DigiCert Global Root G2 certificate authority to avoid Exchange Online email disruption [MC1224565]
Posted inExchange Online

(Updated) Trust DigiCert Global Root G2 certificate authority to avoid Exchange Online email disruption [MC1224565]

Message ID: MC1224565 (Updated) Updated February 4, 2026: We have updated the timeline. We’ve been notified that some email providers may distrust the DigiCert G1 root on April 15, which could result in broad ecosystem‑wide email impact. To ensure Exchange…
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Trust DigiCert Global Root G2 certificate authority to avoid Exchange Online email disruption [MC1224565]
Posted inExchange Online

Trust DigiCert Global Root G2 certificate authority to avoid Exchange Online email disruption [MC1224565]

Message ID: MC1224565 [Introduction]Action might be required to avoid service disruption. To maintain secure and uninterrupted mail flow with Exchange Online, organizations must ensure their servers and clients trust the DigiCert Global Root G2 Certificate Authority (CA) and its subordinate…
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