If you want to buy a certificate for your Exchange 2010 server, and I suggest that you do instead of generating a self signed cert, have a look over at Entrust. We recently bought a 4 year cert from Entrust by recommendation of DGC whom helped us migrate from Exchange 2003 to 2010. So what’s great about Entrust? They allow you to insert multiple domains (10) in one cert without huge costs. This enables you to buy one certificate and it will cover the autodiscovery sub domain as well until you reach 10 unique domains. Find out more here: http://www.entrust.net/ssl-certificates/unified-communications.htm

The only negative part of ordering from Entrust is the rigorous validation process which takes up to a day or two. They will email you a couple of times and also call you which if you live in Europe will happen while you are sleeping. Fortunately you can call them and leave a voice mail to confirm that you really gave them the correct information.

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