Communications Server 2007: Error message when you log on to Microsoft Office Communicator: “Cannot Synchronize Address Book”

SUPPORT SOLUTION:
When you log on to Microsoft Office Communicator, you receive the following error message:Cannot
Synchronize Address BookWhen you click the message to display the
details, you receive the following error message:Cannot
synchronize with the corporate address book. The cause of the problem is
unknown. Please contact your system administrator with this
information.Additionally, the following error message is logged in
the Office Communicator log:URLDownloadToFile terminated,
Url=https://ocs.domain.com/Abs/Ext/F-0918.lsabs, hr=0×800c0008If you
use Windows Internet Explorer to try to manually download any of the address
book files, you receive an HTTP 500 error message. The Internet Information
Services (IIS) log displays the same error..This issue occurs because IIS does not specify the Network
Directory Security credentials to connect to the Address Book Files
folder..Note This issue occurs on the client-side. However, you have to configure the settings on the server that is running Microsoft Office Communications Server to resolve the issue. If you are not familiar with Office Communications Server, contact the server administrator.To resolve this issue, you must have the Administrator permission on the server that is running Microsoft Office Communications Server. .Windows Server 2003-based server
2, ‘resolution’);
Method 1: If the Address Book Files folder is on the computer that
is running Communications Server
3, ‘resolution’);

3, ‘resolution’);
Click Start, click Run,
type inetmgr, and then click
OK.Expand
ServerName, expand Web
Sites, expand Default Web sites, and then expand
Abs. Right-click Ext, and then click
Properties. In the Ext Properties dialog box, click
to select the A directory located on this computer check box
on the Virtual Directory tab, click Browse to
select the Address Book Files folder, and then click
OK.Repeat steps 3 and 4 for Int in the
Abs node.Method 2: If the Address Book Files folder is not on the computer that
is running Communications Server
3, ‘resolution’);
Click Start, click Run,
type inetmgr, and then click
OK.Expand
ServerName, expand Web
Sites, expand Default Web sites, and then expand
Abs. Right-click Ext, and then click
Properties. In the Ext Properties dialog box, click
Connect As on the Virtual Directory
tab.In the Network Directory Security
Credentials dialog box, specify the credentials, and then click
OK.Repeat steps 3 to 5 for Int in the
Abs node..Windows Server 2008-based server
2, ‘resolution’);
Method 1: If the Address Book Files folder is on the computer that
is running Communications Server
3, ‘resolution’);
Click Start, click Run,
type inetmgr, and then click
OK.Expand
ServerName, expand
Sites, expand Default Web sites, and then expand
Abs.Expand Ext and click on Files, in the Actions pane click on Basic SettingsUsing the Physical path setting browse to the Address Book
Files folder.Click OK twice and close the IIS 7.0
Management consoleRepeat steps 3 through 5 for Int in the
Abs node.Method 2: If the Address Book Files folder is not on the computer that is running Communications Server
3, ‘resolution’);
Click Start, click Run,
type inetmgr, and then click
OK.Expand
ServerName, expand Sites, expand Default Web sites, and then expand
Abs.Expand Ext and click on Files, in the Actions pane click on Basic SettingsYou should see the UNC path to the Address Book
shareClick on the Connect As Button, choose
Application user (pass-through authentication)Click OK twice and close the IIS 7.0
Management consoleRepeat steps 3 through 6 forInt in the
Abs node.Note By default IIS 6.0 and IIS 7.0 use pass through authentication
for the Identity of the LSGroupExpAppPool which is the
Domain\RTCComponentService account. By default the remote Address Book Share
has the domain’s Authenticated Users account added to its ACL.

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The issue that is described in the SYMPTOMS section of this article will affect all internal and remote users that are signed into the Office Communicator client. The issue is centric to IIS application pool “LSGroupExpAppPool” that hosts some of the Office Communications Server web services. The LSGroupExpAppPool Identity will provide the correct credentials to the server that is hosting the share that contains the address book files. When this authentication process fails, address book downloads will be globally affected.The “Cannot Synchronize Address Book” notification can pertain to several different physical and logical connectivity issues that the Office Communicator client can have. If the Office Communicator provides additional error information that is relevant to the “Cannot Synchronize Address Book” notification but does not match what is listed in the SYMPTOMS section of this KB article then the steps listed in the RESOLUTION section of this article may not solve this issue.Remote Office Communicator connectivity can be the cause of Address Book synchronization problems that will also provide the “Cannot Synchronize Address Book” notification. Review the information that is listed below to make sure that the remote connectivity to the Communication Server web components is configured correctlyMicrosoft Office Communications Server 2007 R2

Configure a Reverse Proxy

Microsoft Office Communications Server 2007 R2

Planning for External User Access
.For more information about this issue, visit the following Microsoft Website:

939530
The Lync 2010 client or the Office Communicator client does not download the corporate address book and displays a notification: “Cannot Synchronize Address Book”
.

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