Why Microsoft Office Users Saw TLS Certificate Errors and What It Means

Due to a missed renewal of a TLS digital certificate, many Office users began seeing certificate‑expired notifications on June 24 2024.

The expired certificate belongs to the domain

https://support.content.office.net/

, issued on 28 June 2024 and set to expire on 23 June 2025, and Microsoft has not yet replaced it.

Other related Office service domains that share the same certificate include:

fonts.support.content.office.net

image.support.content.office.net

scripts.support.content.office.net

styles.support.content.office.net

support.content.office.microsoft.com

support.content.office.net

Any Office feature that accesses these domains will encounter errors, which explains the certificate‑invalid prompts some users receive when Office tries to load images or scripts.

Microsoft engineers are expected to notice the issue during regular working hours and update the certificate; users may need to wait a few hours for the service to return to normal.