Hi, I would appreciate explanations of what is going on and how one can make Loadgen run. In general it looks like initialization screwed up. Would be good to learn: 1. Why and how to prevent it from happening again; 2. How to "reverse" initialization, if this is needed; 3. How to read LoadGenSim (see an example below). Here is more info. I am just learning how to use Loadgen. So I configuredasimplenew test with just 6 users in one group using Outl2k3 cached client and "heavy" action profile, 5min long "simulated day" and 5 min run length. Initialization took about an hour and then reported successful completion. But LoadGenInit file contains just one sentence: "Engine.Control Warning: 0 : 9/23/2008 2:29:03 PM -- 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." The test failed with the following first lines in the LoadGenSim file: Outlook2003Cached.General Error: 0 : 9/23/2008 3:48:04 PM -- GEN-VCS240 A51B77C1-LGU000005ownloadOAB:There is no OAB folder matches with user's OfflineABDn .Outlook2003Cached.General Error: 0 : 9/23/2008 3:49:56 PM -- GEN-VCS240 A51B77C1-LGU000004ownloadOAB:There is no OAB folder matches with user's OfflineABDn .Engine.Control Error: 0 : 9/23/2008 3:50:28 PM -- TooMuchLoad: t 235; tAferPreTestLogon: 1; exchQueueCount: 5; exchUserCount 6; Engine.General Error: 0 : 9/23/2008 3:50:28 PM -- TaskEngine:ispatchTasks() caught exception:Microsoft.Exchange.Swordfish.SwordfishExceptionTooMuchLoad: Number of unfinished tasks including those in the queue and those are being executed is greater than 1.5 times the number of users. Engine State: StartedTotal Test Runtime: 00:03:01Task Interval: 757Total Users: 6Active Users: 6Task Q Length (shared): 0 (busy workers: 0 of 0)Task Q Length (GEN-VCS240): 6 (busy workers: 80 of 80) at Microsoft.Exchange.Swordfish.TaskEngine.dispatchExchUsers() at Microsoft.Exchange.Swordfish.TaskEngine.dispatchExchTasks() at Microsoft.Exchange.Swordfish.TaskEngine.<dispatchTasks>b__18() at Microsoft.Exchange.Swordfish.IL.ILUtil.DoTryFilterCatch(ThreadStart tryClause, Predicate`1 filterClause, Action`1 catchClause)Engine.General Error: 0 : 9/23/2008 3:50:28 PM -- Simulation failed because the actual duration 00D:00H:00M:00S does not match with the specified duration 00D:00H:10M:00S.Engine.General Warning: 0 : 9/23/2008 3:50:28 PM -- Engine stop time is not set when calculating estimated tasks for user grouup UserGroup9, using DateTime.Now 9/23/2008 3:50:28 PM as the stop time.LoadGenWin Error: 0 : 9/23/2008 3:50:48 PM -- Engine throws an excpetion:Microsoft.Exchange.Swordfish.SwordfishExceptionTooMuchLoad: Number of unfinished tasks including those in the queue and those are being executed is greater than 1.5 times the number of users. Engine State: StartedTotal Test Runtime: 00:03:01Task Interval: 757Total Users: 6Active Users: 6Task Q Length (shared): 0 (busy workers: 0 of 0)Task Q Length (GEN-VCS240): 6 (busy workers: 80 of 80) at Microsoft.Exchange.Swordfish.TaskEngine.dispatchExchUsers() at Microsoft.Exchange.Swordfish.TaskEngine.dispatchExchTasks() at Microsoft.Exchange.Swordfish.TaskEngine.<dispatchTasks>b__18() at Microsoft.Exchange.Swordfish.IL.ILUtil.DoTryFilterCatch(ThreadStart tryClause, Predicate`1 filterClause, Action`1 catchClause) --Leon.