Unable to Search for Distrbution Lists in Lync client.

Hi, 

We have a greenfield deployment of Lync 2010 currently catering for 5000 users in an pilot. Recently we have been unable to search for Distribution lists in the Lync client, however clients used to be able to do this. As this was a greenfield deployment users were complaining about the time it took to search for newly enabled contacts in the Lync Client. To work around this issue the CSClientPolicy was modified to use the AddressbookAvailability as WebSearchOnly. I am wondering if the change to CSClientPolicy could have caused an issues when searching for Distribution Lists.

Thanks, 

Chris