share one record for autodiscover between exch 2007 and exch 2010

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Hi, Everybody,

Our system: 1 AD, Exchange 2010 CAS array sp1(cas2010) and exchange 2007 sp2 (cas2007), to save cost, currently we only use SRV DNS record for exchange 2007 autodiscover and it's working: for IPAD/Iphone and Outlook anywhere. Now I plan to move some users to Ex2010 servers, can I just use the same SRV DNS record (which is cas2007.domain) for both Exchange 2010 users and exchange 2007 users? if I buy autodiscover.domain SSL certificate for cas2010, it will be good for 2007 users too? becuase the domain is the same, I see I must share one record for autodiscover, being SRV record or autodiscover.domain. Which is better between a CAS2007 server or CAS2010 server as the autodiscover endpoint? we have no plan to get rid of EX2007 for long time, so I guess I need both certificates even the autodiscover only has one entry point to outside devices. Thanks for any suggestions.

Sembee [MVP]

Autodiscover will work with both versions, because it queries the domain for the information for the user.
The cost savings of using SRV records are minimal - you can get a UC certificate for less than $80 a year.

Get a 10 name certificate and put both Exchange 2007 and 2010 URLs in to it. The same certificate can then work for both servers.


Simon Butler, Exchange MVP
Blog | Exchange Resources


Thank you for the prompt reply.

I have had ssl for CAS2007 long time ago and still valid, do I gain anything if I replace its SSL with a new SAN SSL? I don't see the point why cas2007 should be included as part of new SAN certificate, I'm confused. Thank you for any suggestions.

Sembee [MVP]

SSL is more than just OWA. If you using Outlook 2007 or higher then web services are used by Outlook to connect to the server. While you can use a self generated certificate this can cause certificate prompts, and therefore a commercial certificate is recommended.
I tend to have all client facing systems in the certificate so that there are no issues with the SSL certificate support no matter which server is used.


Simon Butler, Exchange MVP
Blog | Exchange Resources
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