Auto Discover exchange 2010

We are advertising our AutoDiscover name over the internet ex: contoso.com. When an outlook client connects anywhere they can connect using username@contoso.com. We are expanding and have accepted domains for user users and would like for that name to be advertised as well with Autodiscover. Is this possible to have our certificate setup with multiple @domainnames.
techdriveAsked:
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Nick RhodeIT DirectorCommented:
Yes, you can expand on a UCC to include more sub domians.
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Jon BrelieSystem ArchitectCommented:
Nope.

You need to point autodiscover.otherdomain.com as a cname to your autodiscover URL, or setup an SRV record in DNS for the otherdomain that points it there.

Users will get a pop up saying "Autodiscover.yourdomain.com wants to configure your email..yada yada" and they have to accept.  That way they are connected to your domainname and using your matching cert.
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Simon Butler (Sembee)ConsultantCommented:
If you use a CNAME then you will get SSL errors unless the host name is added to the existing certificate.

There are two options here.
1. As already stated - use a UC type certificate which will include the additional domains.
2. Use SRV records. http://semb.ee/srv

The first option is probably the cleanest, but if you are hosting multiple domains then it can get expensive very quickly.

It is only Autodiscover you have to worry about though - the OWA URL will be the same for everyone.

Simon.
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Jon BrelieSystem ArchitectCommented:
Well, yes.  NRhode is correct.  You can secure multiple TLDs with a UCC cert.

I was thinking of it from a hosting provider standpoint, and the challenges there make it almost impossible to use in this fashion.
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Jon BrelieSystem ArchitectCommented:
CNAMEs will work, but you have to have an IIS redirect on your end to get around the SSL error.

http://social.technet.microsoft.com/wiki/contents/articles/5787.exchange-2010-multi-tenant-autodiscover-and-dns-configuration.aspx
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