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Replacing a self-signed certificate

Last Modified: 2013-11-16
I get this message when I run Exchange 2007 SP3 BPA:

The SSL certificate for 'https://xxxxx.xxxx.xxx/EWS/Exchange.asmx' is self-signed. It does not provide any of the security guarantees provided by authority-signed or trusted certificates. It is strongly recommended that you install an authority-signed or trusted certificate.

I get the same error for the Autodiscover, Microsoft-Server-ActiveSync & Service certificates.

I do have a certificate from Verisign for OWA only, do I need I need a certificate for each of these 4 other self-signed certificates or can I use one certificate for all of them?

What is the proceedure for moving from a self-signed to a commercial certificate?

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