Recently I noticed an exclamation mark in my Skype Client. This happened after upgrading my client from Lync 2013 to Skype4Business 2016 version. My Skype server is in Lync 2013 server version and everything was working fine in Lync 2013 client.
Error
The following error appears : “Cannot synchronize with the corporate address book”. What does it mean ? Peoples are unable to search contact in their skype client.
Fix
Firstly, try to check if your proxy server allows access to the address book. Downloading address book can be blocked by your proxy server. Then try to change the way how Skype4Business accesses the Address Book. By default, this is set to use “File Download” method but there are 3 available settings :
-WebSearchAndFileDownload
-WebSearchOnly
-FileDownloadOnly
To get the default client policy, run “Lync Server Management Shell” and use the following PowerShell command:
Get-CsClientPolicy -Identity Global
Set the AddressBookAvailability parameter to WebSearchOnly:
Get-CsClientPolicy -Identity Global | Set-CsClientPolicy -AddressBookAvailability Websearchonly
Wait a few minutes or restart your skype client. Now the client won’t attempt to download cache file and you can search contact!
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