Hi, We have an Exchange 2007 installed in the CCR environment, All our boxes are Microsoft Windows 2008,Exchange 2007 SP1From the time of installation itself we have the Outlook synchronization error 0X80190194 for the OAB and all the users keeps receving the sync event in the Sync folder of the mailbox.In the Outlook client the OAB has been not created at all, When we use cached mode We get the sync error for OAB If i work offline there is no address in the GAL. I can see the OAB folder has been created in the IIS7 of the CAS, When i see the physical location of the folder, It's Empty in the CAS server, Where as the Mail box server has a folder named and shared as ExchangeOAB, It has the GUID folders (2 no's) Visible and those have the OAB.XML and files with extension .lzx. This is my scenario.We tried recreating the OAB Virtual Directory, no LuckIs there any suggestion for resolving this problem! Do welcome please!

Arul, can you check if your clients are on MAPI or Outlook any where connections?when you open the OAB folder, can you see some contents inside it?Try to recreate OAB http://technet.microsoft.com/en-us/library/bb124270(EXCHG.80).aspxRaj

Hi Arul, Please review the Application log on the Mailbox Server to check whether any error event is logged when generating OAB files Please also review the Application log on the Client Access Server to check whether any error event is logged when the Client Access Server attempts to copy the log files from Mailbox Server. Mike Shen TechNet Subscriber Support in forum If you have any feedback on our support, please contact tngfb@microsoft.com

Which outlook version you are using, and what about roll up ?Cheers Nikhil Kalra

Hi Arul, Any updates?Thanks,Mike