SBS 2011 Outlook over http "the name on the security certificate is invalid or does not match the name of the site"

I have inherited an SBS2011 and are getting the error "the name on the security certificate is invalid or does not match the name of the site" when users open up outlook (version 2010). Once you accept the warning everything works fine and out of office features work from outlook. I need to get rid of this message the following may assist diagnosis: the top of the certificate warning message it says ""
2.when setting up outlook we use the url to connect to my proxy as ""
3.all users are having the issue (all users use http)
4. it is a self-signed certificate
5. after installing certificate on a test machine web mail will work without certificate warning in a browser. Connecting to

Bit of a dinosaur when it comes to certs so any help would be greatly appreciated.
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MAS (MVE)EE Solution Guide - Technical Dept HeadCommented:
You should add "" in your certificate to avoid this error
drwltdAuthor Commented:
Thank you for your help how would i add "" to my certificate?.
MAS (MVE)EE Solution Guide - Technical Dept HeadCommented:
You have to issue the certificate from an internal CA by adding autodiscover as a SAN

But I strongly suggest you to buy a certificate from a trusted CA(eg.Digicert etc) which will save you a lot time

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drwltdAuthor Commented:
Thanks again for your help. do you know any of guides to go down the self signed route as not convinced the MD will splash out.
MAS (MVE)EE Solution Guide - Technical Dept HeadCommented:
Instal an internal CA in your domain n issue a new certificate with the SAN included

This will be helpful aswell
drwltdAuthor Commented:
went for the Trusted CA in the end thank you for your help
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