hi can anybody tell me when i run Load genarator test on Exchange Server for 2500 users i got following error ... Outlook2003Online Error: 0 : 9/1/2008 1:38:49 PM -- Microsoft.Mapi.MapiExceptionInvalidParameter: MapiExceptionInvalidParameter: Unable to make connection to the server. (hr=0x80070057, ec=-2147024809)Diagnostic context: Lid: 23234 Lid: 27970 StoreEc: 0x80070057 Lid: 17730 Lid: 25922 StoreEc: 0x80070057 at Microsoft.Mapi.MapiExceptionHelper.ThrowIfError(String message, Int32 hresult, Int32 ec, DiagnosticContext diagCtx) at Microsoft.Mapi.ExRpcConnection.Create(ConnectionCache connectionCache, ExRpcConnectionCreateFlag createFlags, ConnectFlag connectFlags, String serverDn, String userDn, String user, String domain, String password, String httpProxyServerName, Int32 ulConMod, Int32 lcidString, Int32 lcidSort, Int32 cpid, Int32 cReconnectIntervalInMins, Int32 cbRpcBufferSize, Int32 cbAuxBufferSize) at Microsoft.Mapi.MapiStore.OpenMapiStore(String serverDn, String userDn, String mailboxDn, Guid guidMailbox, Guid guidMdb, String userName, String domainName, String password, String httpProxyServerName, ConnectFlag connectFlags, OpenStoreFlag storeFlags, CultureInfo cultureInfo, Boolean wantRedirect, String& correctServerDN, ClientIdentityInfo clientIdentity, String applicationId) at Microsoft.Mapi.MapiStore.OpenPublicStoreNoRedirect(String serverDn, String userDn, String userName, String domainName, String password, ConnectFlag connectFlags, OpenStoreFlag storeFlags, CultureInfo cultureInfo, String& correctServerDN, WindowsIdentity windowsIdentity) at Microsoft.Exchange.Swordfish.Extensions.MapiCommon.MapiStoreUtil.<>c__DisplayClass6.<OpenPublicStore>b__4() at Microsoft.Exchange.Swordfish.IL.ILUtil.DoTryFilterCatch(ThreadStart tryClause, Predicate`1 filterClause, Action`1 catchClause) at Microsoft.Exchange.Swordfish.Extensions.MapiCommon.MapiStoreUtil.OpenPublicStore(User user, ConnectFlag connectFlags, OpenStoreFlag openStoreFlags) at Microsoft.Exchange.Swordfish.Extensions.MapiCommon.MapiUtil.ModuleInitPublicFolder(GlobalSettings gs) sorry for bad words but... can ny body tell me wht da f**** is that and y i m not able to succeed to pass this test i want to test for 3000 users... Thanx Regards Vaibhav