Security warning when you start Outlook 2007 and then connect to a mailbox that is hosted on a server that is running Exchange Server 2007 or Exchange Server 2010

Here is the microsoft article I have followed.

This has not fixed the issue.
I have made a few minor changes since then to no avail.

The warning the users are getting is the auto discovery cert is not valid.  As for users attaching from the outside URL I am not worried about.  But it is becomming a nuisance since all of the users are using Outlook 2007 within the network and recieve an error every time they open outlook.

I also read that a multiple domain name cert would need to be purchased to make these go away.   Any information on what I can do to resolve this would be great.

I also have the internal DNS to make it so they can type the extnernal address and access the server.

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Alan HardistyCo-OwnerCommented:
For Exchange 2007 / 2010 as you have stated, a multi-name (SAN / UCC) certificate is required for correct operation.
The certificate should include the following names:
That should resolve your certificate warning.

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Shreedhar EtteCommented:

Observed that certificate installed on the exchange server not proper.

It shoudl contain the bleow Subject Alternate Names:
exchangeservername e.g exchange
server fqdn e.g.

To fix this get 3rd party certificate.

I hope this helps,
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