Hi, When trying to use LoadGen on a 2007 CAS with 'OWA Module' as my client type the test is failing with the error below: "LoadGenWin Error: 0 : 8/5/2011 10:56:47 AM -- System.NullReferenceException: Object reference not set to an instance of an object. at Microsoft.Exchange.Swordfish.Extensions.StoreBuilder.Builder.buildFolderItems(User user, MapiStore store, NamedPropTag namedPropTag, SoftMessageCollection softMessages, Byte[] folderEntryId, MapiFolder folder, Int32 messageCount, Double unreadPercentage, Int32 minRecipients, Int32 maxRecipients, Int32 avgRecipients) at Microsoft.Exchange.Swordfish.Extensions.StoreBuilder.Builder.BuildPublicFolders(User user, PublicStoreProfile storeProfile) at Microsoft.Exchange.Swordfish.GUI.MailboxInitPage.initializePublicStore() Engine.Control Warning: 0 : 8/5/2011 10:56:50 AM -- It's possible that extended ESE Performance Counters is disabled on the server. Please refer to http://technet.microsoft.com/en-us/library/aa997018.aspx for how to enable it." This KB (http://technet.microsoft.com/en-us/library/aa997018.aspx) is for 2003 servers and apparently has no relevance on 2007 servers Thank you, Mid

Hi, What's version of LoadGen you are using? Please try to use the latest version LoadGen 2010. It will run on only Windows Vista or Windows Server 2008.