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the security certificate is not from a trusted CA

Exchange 2013 cu21

i don't have a lot of experience working with ssl certificates with Exchange 2013. from what i can gather, i just generate a CSR, submit it to a CA, and i'll get back a renewed certificate good for another year or so.

i did just that, got the .CER and completed the request from ECP. but this morning, a lot of my users (who don't have Internet access) are complaing they are receiving below message when opening their Outlook.

i have also assigned the services required to this new certificate

how do you resolve such problem?

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