Outlook 365: The security certificate has expired


i get error for the certificate expired.
when i open the certificate the issuer is let’s encrypt.
how can i extend the certificate?


Hi @gilkor,

Do you have any knowledge of how the certificate was originally obtained? Did someone else do that for you?


i have no idea.
could be the domain host but not sure


Contact the administrator for your Office 365 account - he installed the let’s encrypt certificate.


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