EDIT 10/4/2007: Since this post has been published, we have updated the Exchange 2007 Autodiscover Service whitepaper to include this information. Please consult the whitepaper for most up-to-date ...
Updated Jul 01, 2019
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Outlook 2007 can now use DNS SRV records to find the location of the Exchange Autodiscover Service
AdamX,
You should not use the same certificate/url for servers in multiple sites. As a general rule, you should consider that you have 1 URL per-site. If you have multiple CAS's in an Internet-facing site, you should load-balance them. If the second site will be Internet-facing (meaning you will have a separate URL entry-point) then you should get a second SSL certificate for the separate URL. If it will be non-internet facing, you will be quite alright to simply leave the default URL's and self-signed certificate in place. Information similar to this is covered in a blog post on my site (http://blogs.msdn.com/brad_hughes/archive/2007/09/10/cas-load-balancing-certificates-autodiscover-and-webservices.aspx)
Hope this helps,
Brad
You should not use the same certificate/url for servers in multiple sites. As a general rule, you should consider that you have 1 URL per-site. If you have multiple CAS's in an Internet-facing site, you should load-balance them. If the second site will be Internet-facing (meaning you will have a separate URL entry-point) then you should get a second SSL certificate for the separate URL. If it will be non-internet facing, you will be quite alright to simply leave the default URL's and self-signed certificate in place. Information similar to this is covered in a blog post on my site (http://blogs.msdn.com/brad_hughes/archive/2007/09/10/cas-load-balancing-certificates-autodiscover-and-webservices.aspx)
Hope this helps,
Brad