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SSL for Exchange 2010

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Last Modified: 2012-05-11
We just got a 2008 R2 server that runs Exchange 2010.
Right now we just have a self-signed SSL in which is issued to "mail" (not "mail.example.com", just "mail") and it cause security warnings for OWA and ActiveSync.
I want an SSL that won't give any of these errors and will work with and allow me to setup Outlook Anywhere.

First off, will just the standard GoDaddy SSL for $12.99 suffice?  I ask because some people talk about getting a SAN or UCC SSL (or whatever its called) to cover all the following:
mail.example.com
autodiscover.example.com
internalservername.internaldomain.local
internalservername
However, I don't see why the SSL needs to cover the ".local" address, just the internal name, and the "autodiscovery" on our server is a subfolder (mail.example.com/autodiscover), not a subdomain (I think anyways).

Can someone explain, and tell me if a simple GoDaddy certificate issued for "mail.example.com" will suffice?
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