Question now is, what certificate used in Exchange 2007?
- Internet client, like POP3 and IMAP4 client access
- Outlook Web Access
- Outlook Anywhere
- Edge Server
Now, since there are so many components, can we use all with the same name? The answer is no. Thus, in Exchange 2007, we will need certificate that support wildcards name. However, by default, when installing Exchange 2007, a self signed certificate is installed - can we use it? Yes, you can, but we will not recommend as it will not know the Internet domain name you are going to use, not supporting SAN extension supports (X.509 standard).
After knowing this, choosing a right certificate in Exchange 2007 is important. Knowing Exchange 2007 client that support wildcard certificate is also another challenge. For what we know as for now, the following client do support:
Outlook Express, Outlook, Internet Explorer (OWA)
However, clients running Windows Mobile 5.0 do not support secure connection to servers where wildcards are used in the certificate. Do take note.