[ExchangeList] Certificates for publishing Exchange 2007 with ISA Server 2006

http://www.msexchange.org
-------------------------------------------------------Hi

We have been using a self signed SAN certificate installed on the Exchange and 
ISA servers. This has worked well with only non-domain member  machines  and 
mobile active-sync users complaining about the certificates.
The ISA server is a member of the internal domain.

We now want to purchase a 3rd party SAN certificate and my questions are

- can we use separate certificates for communication between external users, 
ISA  and Exchange servers

- can we use the 3rd party certificate on the ISA server listener for external 
users only and then use the self-signed certificate for communication between 
ISA and Exchange server.

- if it is then where do I create the certificate request from - Exchange 
server or ISA server?

The SAN certificate contains:
webmail.domain.net
autodiscover.domainb.net
exch01.domain.local
exch01

The autodiscover domain is our email address domain.

Thanks

Raji A

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