We keep get the warning bellow on our exchange server. It is Exchange SP1 with rollup 8 installed; running on Server 2008 Standard. This server has the Mailbox, CAS and Hub Transport roles; it has .NET 3.5 SP1 installed. There is also another post with the same problem in the client forum and a link to it here: http://social.technet.microsoft.com/Forums/en-US/exchangesvrclients/thread/7473ceae-1c92-44bc-a154-c274b6496163 Log Name: Application Source: ASP.NET 2.0.50727.0 Date: 5/27/2009 11:51:24 AM Event ID: 1309 Task Category: Web Event Level: Warning Keywords: Classic User: N/A Computer: SERVER.DOMAIN.COM Event code: 3005 Event message: An unhandled exception has occurred. Event time (UTC): 5/27/2009 3:51:24 PM Event ID: 956ae9044f514c138d57dc5d2a609ef5 Event sequence: 15660 Event occurrence: 5 Event detail code: 0 Application information: Application domain: /LM/W3SVC/1/ROOT/owa-1-128874766147491262 Trust level: Full Application Virtual Path: /owa Application Path: C:\Program Files\Microsoft\Exchange Server\ClientAccess\owa\ Machine name: SERVER Process information: Process ID: 4596 Process name: w3wp.exe Account name: NT AUTHORITY\SYSTEM Exception information: Exception type: OwaDefaultFolderIdUnavailableException Exception message: XSO returned null for default folder id Search Folder. Request information: Request URL: Request path: User host address: User: Is authenticated: False Authentication Type: Thread account name: NT AUTHORITY\SYSTEM Thread information: Thread ID: 107 Thread account name: NT AUTHORITY\SYSTEM Is impersonating: False Stack trace: at Microsoft.Exchange.Clients.Owa.Core.UserContext.GetDefaultFolderId(DefaultFolderType defaultFolderType, String folderName) at Microsoft.Exchange.Clients.Owa.Core.FolderSearch.ClearSearchFolders(UserContext userContext) at Microsoft.Exchange.Clients.Owa.Core.UserContext.Dispose(Boolean isDisposing) at Microsoft.Exchange.Clients.Owa.Core.UserContextManager.TerminateSession(UserContext userContext, CacheItemRemovedReason abandonedReason) at Microsoft.Exchange.Clients.Owa.Core.UserContextManager.UserContextRemovedCallback(String key, Object value, CacheItemRemovedReason reason) at System.Web.Caching.CacheEntry.CallCacheItemRemovedCallback(CacheItemRemovedCallback callback, CacheItemRemovedReason reason)

Hi, I have running Exchnage 2007 rollup 8 on Windows 2003 without any issues. Start .NET Runtime Optimization Service v2.0.50727_x64 and try again. Regards Chinthaka

Hi,The issue has been reported to Product group,any update I will post here.Thanks.Regards,Xiu

Hi Xiu, One of our cas servers has the same issue, is there any solution for this warnings (EventID 1309) Both CAS servers are running the same at the level (SP2-rollup4) only one of them reports this warnings. This warning was reported also before the installation of SP2. Event Type: Warning Event Source: ASP.NET 2.0.50727.0 Event Category: Web Event Event ID: 1309 Date: 6/22/2010 Time: 5:33:26 PM User: N/A Computer: NLAMXA101 Description: Event code: 3005 Event message: An unhandled exception has occurred. Event time: 6/22/2010 5:33:26 PM Event time (UTC): 6/22/2010 3:33:26 PM Event ID: ac154901cc794119bed72458ae323add Event sequence: 19008143 Event occurrence: 204 Event detail code: 0 Application information: Application domain: /LM/W3SVC/1/ROOT/owa-1-129097884039531250 Trust level: Full Application Virtual Path: /owa Application Path: C:\Program Files\Microsoft\Exchange Server\ClientAccess\owa\ Machine name: NLAMXA101 Process information: Process ID: 2024 Process name: w3wp.exe Account name: NT AUTHORITY\SYSTEM Exception information: Exception type: OwaDefaultFolderIdUnavailableException Exception message: XSO returned null for default folder id Search Folder. Request information: Request URL: Request path: User host address: User: Is authenticated: False Authentication Type: Thread account name: NT AUTHORITY\SYSTEM Thread information: Thread ID: 126 Thread account name: NT AUTHORITY\SYSTEM Is impersonating: False Stack trace: at Microsoft.Exchange.Clients.Owa.Core.UserContext.GetDefaultFolderId(DefaultFolderType defaultFolderType, String folderName) at Microsoft.Exchange.Clients.Owa.Core.FolderSearch.ClearSearchFolders(UserContext userContext) at Microsoft.Exchange.Clients.Owa.Core.UserContext.Dispose(Boolean isDisposing) at Microsoft.Exchange.Clients.Owa.Core.UserContextManager.TerminateSession(UserContext userContext, CacheItemRemovedReason abandonedReason) at Microsoft.Exchange.Clients.Owa.Core.UserContextManager.UserContextRemovedCallback(String key, Object value, CacheItemRemovedReason reason) at System.Web.Caching.CacheEntry.CallCacheItemRemovedCallback(CacheItemRemovedCallback callback, CacheItemRemovedReason reason) Custom event details: For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. regards, Kees

Hi, we have the same issue - did anybody find a solution? Exchange 2007 SP2, UR 4, all Roles on one server. Best regards, Thomas