Hi...this is my first time I post in this forum. I'm so desperate and don't know anywhere else to ask so I decide to ask it here. Hope you guys can help me understand more about Exchange. I have 2 servers, installed with Windows 2008 R2 and Exchange 2007 SP3. All the cluster system and the exchange system are up and seems fine. But I want to do some stress test before I start migrating mailboxes to this new clustered servers. I've heard about JetStress Tool. I've downloaded and installed JetStress 2010. When I run it via UI I see this errors. I've tried to google it, read the documentation, asked my friends, and no one know for sure what's wrong with it. I've checked JetStress 2010 docs, it should be compatible with Windows 2008 R2. But most will install Exchngae 2010 along with Windows 2008 R2. I don't know if any other has ever installed a system like mine. I really wonder if JetStress can't test Exchange 2007 along with Window 2008 R2. The error below states if the ese.dll in not supported for this windows version. 9/1/2010 1:56:31 PM -- Microsoft Exchange Jetstress 2010 Core Engine (version: 14.01.0180.003) detected. 9/1/2010 1:56:31 PM -- Windows Server 2008 R2 Enterprise (6.1.7600.0) detected. 9/1/2010 1:56:31 PM -- Microsoft Exchange Server Database Storage Engine (version: 08.03.0083.000) detected. 9/1/2010 1:56:31 PM -- Microsoft Exchange Server Database Storage Engine Performance Library (version: 08.03.0083.000) detected. 9/1/2010 1:56:31 PM -- Unsupported version of C:\Program Files\Exchange Jetstress\ese.dll detected (version: 08.03.0083.000 64 bits) for this version of Windows. 9/1/2010 1:56:34 PM -- MSExchange Database or MSExchange Database ==> Instances performance counter category is not registered.

Hi, Jetstress testing should be performed before you install Exchange on the server. Install Jetstress http://technet.microsoft.com/en-us/library/ff459260.aspx Besides, I think you may try to us Jetstress for Exchange 2007 Server. Microsoft Exchange Server Jetstress http://technet.microsoft.com/en-us/library/bb643093(EXCHG.80).aspx Regards, Xiu

Hi There, I have the same problem as the OP - Exchange 2007 SP3 enables support for Windows 2008 R2, but it would appear that JetStress 2010 has not been updated to recognise or support this configuration. I have also tried to use JetStress 2007, but this will not even install on Windows Server 2008 R2, as the installer says that it requires either W2K, W2K3 or "Longhorn" (W2K8 SP1). When will an updated version of JetStress 2010 be released to support this configuration? Thanks, Rob.