Getting a Security Alert with Outlook 2007 and Exchange 2007 regarding a certificate

Outlook 2007 Client
Exchange 2007 Server

All of a sudden, Outlook 2007 Clients are getting the following error message:
Information you exchange with this site cannto be viewed or changed by others.  However, there is a problem with the site's security certificate.

The name on the security certificate is invalid or does not match the name of the site.

Who is Participating?
praveenkumare_spConnect With a Mentor Commented:
autodiscover url will be some thing like ,
it is the one which gives the users oof,oab urls
does the website address, autodiscover url and the server name is present in the certificate "Subject Alternative Name"
if not we have to get a certificate which has the same
cliffordgormleyAuthor Commented:
What is an Autodiscover URL?
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