I have installed Exchange 2007 and both Outlook 2007 client access and OWA access was working, I then purchased a SSL certficate, which is now successfully working externally, but in the process of getting it working I deleted the self signed certificate exchange creates during installation.Now internally when I access Outlook 2007 I get a Security alert, servername.domain.local, The name on the security certificate is invalid or does not match the name of the site. When I view the certificate it is using the external SSL cert I added for external OWA access.How can I resolve this issue, can I regenerate the certificate that was added during installation? Any suggestions would be appreciated.

hi,yes you can recreate certificate.just look at here, Henrik tells it very successfully;http://www.msexchange.org/articles_tutorials/exchange-server-2007/mobility-client-access/securing-exchange-2007-client-access-server-3rd-party-san-certificate.htmland also you can follow these steps; Step 1: Obtain an SSL certificate There are three ways to obtain a Secure Sockets Layer (SSL) certificate: - Option 1: Use the self-signed SSL certificate that Exchange 2007 installs by default. Use of the self-signed certificate is not supported by Outlook Anywhere or the offline address book. - Option 2: Purchase an SSL certificate from a well-known certification authority (CA). - Option 3: Obtain an SSL certificate from a Windows PKI certification authority. If you choose Option 1, skip steps 2 and 3 and go straight to step 4. If you choose Option 2 or Option 3, go straight to step 2. Note: For all three options, Exchange ActiveSync will require the device to have a copy of the SSL certificate installed in the Trusted Root Certificate Store. Step 2: Generate and submit the certificate request Create a new certificate request for Secure Sockets Layer (SSL) services. 1. Open the Exchange Management Shell. 2. Run the following command, replacing domainname and friendlyname with your domain name and display name: New-ExchangeCertificate -GenerateRequest -domainname mail.contoso.msft,autodiscover.contoso.msft,myserver,myserver.internal.contoso.msft -FriendlyName mail.contoso.msft -privatekeyexportable:$true -path c:\cert_myserver.txt Note: "DomainName" is used to populate one or more domain names (FQDNs) or server names in the resulting certificate request. Note: "FriendlyName" is used to specify a display name for the resulting certificate. The display name must be fewer than 64 characters. 3. Submit the request to the certification authority and have the CA generate the certificate. Step 3: Enable the certificate on the Default Web site After your certificate has been generated, you must import it and then enable the certificate on the Default Web site. From the computer where step 2 was run, import the certificate. To import the certificate, do the following: 1. Open the Exchange Management Shell. 2. Run the following command. Import-ExchangeCertificate -path c:\newcert.cer Note: "c:\newcert.cer" is the location and name of your certificate. Copy the thumbprint of the certificate, which is the digest of the certificate data, to the clipboard by doing the following: 1. Open the Exchange Management Shell. 2. Run the following command: dir cert:\LocalMachine\My | fl 3. Locate the certificate that you just imported by finding the one that matches FriendlyName from step 2. Then copy the Thumbprint property of that certificate to the Windows Clipboard. Enable the certificate on the Default Web site by doing the following: 1. Open the Exchange Management Shell. 2. Run the following command: enable-ExchangeCertificate -thumbprint <value copied to the Clipboard> -services "IIS,IMAP,POP" 3. Using the "enable-ExchangeCertificate" cmdlet will update the certificate mapping, replacing the self-signed certificate that is installed by default with Exchange 2007 and configured in IIS, IMAP4, POP3. Step 4: Require the Client Access server virtual directories to use SSL By default, the Default Web site in IIS is configured to require SSL for all virtual directories except the offline address book virtual directory. However, you can configure additional virtual directories for each Client Access feature. You must confirm that each virtual directory is configured to require SSL. The Client Access virtual directories are as follows: - Outlook Web Access 2007 virtual directory: owa - Outlook Web Access 2003 and WebDAV virtual directories: exchange and public - Exchange ActiveSync virtual directory: Microsoft-Server-ActiveSync - Outlook Anywhere virtual directory: Rpc - Autodiscover virtual directory: Autodiscover - Exchange Web Services virtual directory: EWS - Unified Messaging virtual directory: Unified Messaging - Offline Address Book virtual directory: OAB For each of the Client Access virtual directories that you will use, open Internet Information Services (IIS) Manager, and follow these steps: 1. Under Default Web site, select the virtual directory that you want, for example, "owa". 2. Right-click the virtual directory, and then click "Properties". 3. Click the "Directory Security" tab. 4. In the "Secure Communications" section, click "Edit". 5. In the "Secure Communications" dialog box, make sure that both the "Require secure channel (SSL)" check box and the "Require 128-bit encryption" check box are selected. 6. Click "OK" to save your changes. 7. Restart the POP3 and IMAP4 services by opening the Services Windows administrative tool, selecting "Microsoft Exchange POP3" or "Microsoft Exchange IMAP4", right-clicking the name of the service, and then clicking "Restart". IIS does not have to be restarted. Read more about SSL on the Client Access server - Managing Client Access Security. regards,Mumin CICEK | Exchange - MVP | www.cozumpark.com | www.mumincicek.com

I had this excact same problem and I had to add a foward lookup in DNSfor my external website. after that I had to change a few URLs check out this link it covers how to do this.http://support.microsoft.com/kb/940726

Hi,I think we may have two option for this case.1. Try to purchase a SAN certificate which has internal domain name,external domain name.2. Try to create A record for External domain name and then point to IP address of CAS server.After that,we need to configure the autodiscoverinternaluri and externaluri with external domain name.Set-ClientAccessServer -identity <servername> -AutodiscoverServiceInternalUri https://autodiscover.contoso.com/autodiscover/autodiscover.xmland then configure Exchange Services for the Autodiscover service.How to Configure Exchange Services for the Autodiscover Servicehttp://technet.microsoft.com/en-us/library/bb201695.aspxWhite Paper: Exchange 2007 Autodiscover Servicehttp://technet.microsoft.com/en-us/library/bb332063.aspx#HowtoConfigureExchangeServicesRegards,Xiu