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from godaddy <br />
You cannot upgrade a UCC to include more names. If you are using all of the slots available in your current UCC certificate, and you need to cover another domain, you'll need to purchase a new certificate to add another domain name.
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Thanks David, I have not used up all my slots on the GoDaddy SSL, just added a new SAN to an empty one. &nbsp;All the stuff with the certificate is complete and under control. &nbsp;The issue is just with getting the update in Exchange, as per my question.
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bgrsyd

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Thank you all.<br><br>That clears it up, I guess it's obvious if the details of the certificate have changed it needs a re-key.
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<p>I have added an additional SAN (sub domain) to an existing GoDaddy UCC SSL. &nbsp;Added this to enable the Download Domain security feature in Exchange.</p><p>The certificate, without the new SAN, is already installed on an 2019 Exchange Server, everything works just fine.</p><p>My question is,&nbsp;</p><p>To install this updated certificate, do I need to generate a new REQ and basically re-key it? &nbsp;Exchange doesn't seem to allow the import of the updated key without first generating the REQ</p><p>Thanks,</p><p>Bruce</p>
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I have added an additional SAN (sub domain) to an existing GoDaddy UCC SSL.  Added this to enable the Download Domain security feature in Exchange.
The certificate, without the new SAN, is already installed on an 2019 Exchange Server, everything works just fine.
My question is, 
To install this updated certificate, do I need to generate a new REQ and basically re-key it?  Exchange doesn't seem to allow the import of the updated key without first generating the REQ
Thanks,
Bruce

from godaddy 
You cannot upgrade a UCC to include more names. If you are using all of the slots available in your current UCC certificate, and you need to cover another domain, you&#39;ll need to purchase a new certificate to add another domain name.


Thanks David, I have not used up all my slots on the GoDaddy SSL, just added a new SAN to an empty one.  All the stuff with the certificate is complete and under control.  The issue is just with getting the update in Exchange, as per my question.


Thank you all.
That clears it up, I guess it&#39;s obvious if the details of the certificate have changed it needs a re-key.

How to UPDATE and existing valid UCC SSL certificate on Exchange 2019


I have added an additional SAN (sub domain) to an existing GoDaddy UCC SSL.  Added this to enable the Download Domain security feature in Exchange.
The certificate, without the new SAN, is already installed on an 2019 Exchange Server, everything works just fine.
My question is, 
To install this updated certificate, do I need to generate a new REQ and basically re-key it?  Exchange doesn&#39;t seem to allow the import of the updated key without first generating the REQ
Thanks,
Bruce

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Security is the protection of information systems from theft or damage to the hardware, the software, and the information on them, as well as from disruption or misdirection of the services they provide. The main goal of security is protecting assets, and an asset is anything of value and worthy of protection.  Information Security is a discipline of protecting information assets from threats through safeguards to achieve the objectives of confidentiality, integrity, and availability or CIA for short. On the other hand, disclosure, alteration, and disruption (DAD) compromise the security objectives.

Security

Installation is the act of making a computer program program ready for execution. Because the process varies programs often come with a specialized program responsible for doing whatever is needed for their installation. Installation may be part of a larger software deployment process. Cross platform installer builders that produce installers for Windows, Mac OS X and Linux include InstallAnywhere, InstallBuilder and Install4J. Installers for Microsoft Windows include Windows Installer, InstallShield, and Wise Installation Studio; free installer-authoring tools include NSIS, IzPack, Clickteam, InnoSetup, InstallSimple and WiX. Mac OS X includes Installer, and also includes a separate software updating application.