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Starting from June 24, 2025, certain users of Microsoft Office software have been confronted with persistent prompts indicating certificate expiration. This issue stems from Microsoft's oversight in timely renewing the pertinent TLS digital certificate. The domain affected, whose certificate was issued on June 28, 2024, with an expiration date set for June 23, 2025, remains without a renewed or updated certificate to this day. SSL/TLS certificates play a crucial role in verifying system identity and safeguarding network communications through encryption. Businesses commonly deploy these certificates on servers to assure the trustworthiness of website identities and support the HTTPS security protocol. Users can confirm the validity of a certificate by observing the padlock icon in the browser's address bar, the 'https' prefix, and by reviewing certificate details.
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