You cannot download the corporate address book, and you receive an error message when you use Communicator 2007 to log on Communications Server 2007: "Cannot Synchronize Address Book"

When you use Microsoft Office Communicator 2007 to log on Microsoft Office Communications Server 2007, you cannot download the corporate address book. No result is displayed when you search contacts by name.

Also, you receive the following error message in Communicator 2007: When you click the message to display the details, you receive the following error message:If you run the Validation Wizard on the Communications Server 2007 front-end server, you receive the following error message in the log:In the Validation Wizard log, expand Diagnose WebComponents, expand Check Connectivity, and then expand Checking Address Book Server configuration. The URL of the location to download the address book and the following error message are indicated in Check Http URL field.

This issue occurs if the Web site that hosts the address book does not have a valid Secure Sockets Layer (SSL) certificate installed.

To resolve this issue, make sure that the Web site that is hosting the address book has a valid SSL certificate installed. To do this, follow these steps:

1. On the computer that is running Internet Information Services (IIS), click Start, click Run, type inetmgr.msc, and then click OK.
2. Expand ComputerName (local computer), expand Web Sites, right-click the Web site that hosts the address book, and then click Properties.
3. Click the Directory Security tab.
4. In the Secure communications section, determine whether View Certificate is enabled.
   
   Note If View Certificate is enabled, click View Certificate. Then, you can determine whether the certificate is valid.
   • If the certificate is invalid, follow these steps:
     1. Click Server Certificate in the WebSiteName Properties dialog box.
     2. Click Next, click Renew the current certificate. Or, click Replace the current certificate. Then, follow the steps to finish the IIS Certificate Wizard.
        
        Note The IIS Certificate Wizard will help you renew your certificate or to replace your certificate with a valid certificate.
        
        For more information about how to request a certificate and install the certificate in IIS, click the following article number to view the article in the Microsoft Knowledge Base:
        299875  (http://support.microsoft.com/kb/299875/ ) How to implement SSL in IIS
   • If View Certificate is disabled, no certificate is installed on this computer. You have to install a certificate to this Web site. To do this, follow these steps:
     1. Click Server Certificate in the WebSiteName Properties dialog box.
     2. Click Next, click Create a new certificate, and then follow the steps to finish the IIS Certificate Wizard.
        
        Note The IIS Certificate Wizard will help you install a certificate to this Web site.
        
        For more information about how to request a certificate and to install the certificate in IIS, click the following article number to view the article in the Microsoft Knowledge Base:
        299875  (http://support.microsoft.com/kb/299875/ ) How to implement SSL in IIS