I just order a new certificate from Entrust for my exchange server and webmail to replace the expired one, I’m able to install and enabled for IMAP, POP, IIS and SMTP, but when I use outlook, it shows “The security certificate has expired or is not yet valid” and when I run Get- ExchangeCertificate it shows “Status : Unknown” on the new certificate. It seems outlook still using the old cert. How can I change the status? Please help, thanks in advance. Cert.jpg
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