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Microsoft hits snooze again on security certificate renewal

ID: ca2db538-d7db-545f-a32b-074d79c13047

STIX ID: report--ca2db538-d7db-545f-a32b-074d79c13047

Feed Name: The Register (Security)

Date Published: 2024-06-28

Date Updated: 2026-04-26

Author: Richard Speed

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A Microsoft TLS certificate for cdn.uci.officeapps.live.com—and reportedly the Microsoft Azure ECC TLS Issuing CA 01—expired, triggering security warnings in Microsoft 365/Office apps and affecting organizations (e.g., a forum report of 200 PCs), reflecting a recurring certificate management issue while Microsoft has been contacted for comment.

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