What will happen if I change Exchange self-signed certificate?

What will happen if I change Exchange self-signed certificate to new and user outside organization does not have imported it yet?
He uses Exchange 2003. Will be still able to connect?
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pospichalalesAsked:
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chakkoCommented:
If the user outside has Outlook configured for RPC/HTTPS access then they will not be able to connect with outlook.  They can access OWA and then from there they can install the certificate into their PC.

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cmartellCommented:
He will still be able to connect but he will see a warning stating that there is a problem with the web site's certificate.  When he clicks on "Continue to this website (not recommended)" he will be taken to the site.
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pospichalalesAuthor Commented:
I tried it with Outlook 2010 and I am unable to connect to Exchange server. There is error.
If it is same with Outlook 2003, I will contact user before changing.
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