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How many SSL certificates rquired for hosting exchange 2010

Last Modified: 2012-05-09
I'm looking to purchase an 3rd party ssl certificate to install for a hosted exchange environment
I know that 1 will definitely be needed in having users visit the website for OWA (so people will not have to see that nagging web page warning) or provisioning their email clients for RPC/HTTP
for example:  mail.mydomain.com
We're looking to also enable the autodiscover service and will another SSL cert be necessary for autodiscover.mydomain.com?

I understand we will need any client domains to have an autodiscover CNAME pointed to our autodiscover record

We will have users internal and external to the domain accessing email from owa or outlook
Currently have 2 servers:
1 exchange server 2010 on win 2008 r2
1 win 2008 r2 domain controller

I see that Godaddy has a multiple domain UCC available for purchase

If multiple domain SSL cert is necessary, is it ideal to have all the names in one?
- mail.mydomain.com
- autodiscover.mydomain.com
- servername
- servername.mydomain.local

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