Outlook certificate mismatch

When outlook launch, it pop-up security Alert about Certificate mismatch (see attachment), this incident occurred after update a new SSL to Exchange server
Worasit SuwanamisaraSystem AdminAsked:
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MASEE Solution Guide - Technical Dept HeadCommented:

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Was the ca signing certificate published as trusted through GPO?

Potentially your new certificate does not cover all the needed.......

You forgot to attach the error.
Look at the old certificate detail versus the new...
Worasit SuwanamisaraSystem AdminAuthor Commented:
RE-attach capture screen
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No attachment. After browsing and selecting a file, click on "Upload file".
Restart the IIS on all the CSS servers and check the behaviour
Hemil AquinoNetwork EngineerCommented:
SSL mismatch means you dont have a trusted certificate.
You need to buy a third party certificate to encrypt all your emails. This certificate must be a SAN certificate.
Once you get the certificate you have to make sure you have added the following domains inside of the CRT file.


After you have issued the certificate, then you have to install it in your exchange server and apply it to IIS, SMTP,IMAP.

Hope it helps,
MASEE Solution Guide - Technical Dept HeadCommented:
Wrong assignment
MASEE Solution Guide - Technical Dept HeadCommented:
Enough information to confirm an answer.
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