In the company there are five servers, is a new implementation 1. Client Access Server CAS01 2. Client Access Server CAS02 3. Hub Transport Server HUB01 4.Hub Transport Server HUB02 5. One Cluster CCR MBX1 All Servers have Exchange 2007 SP1 and Roll UP 3 fo Exchange 2007 SP1 When I try to configure the Outlook Anywherein theCAS01 and CAS02 show the message in the event viewer Watson report about to be sent to dw20.exe for process id: 4244, with parameters: E12, c-RTL-AMD64, 08.01.0291.001, M.E.ServiceHost, M.E.RPCOverHTTPAutoconfig, M.E.S.R.Servicelet.UpdateValidPorts, System.ArgumentOutOfRangeException, d639, 08.01.0291.001. ErrorReportingEnabled: False Event ID: 4999 Source: MSExchange Common In the services.msc, I watch Microsoft Exchange service Hosts - not start after of error in the event viewer, then I disabled Outlook AnyWhere and can started the Microsoft Exchange service Hosts In the Registry 1. Click start Run2. Regedit - this will open the registry editor3. HKEY_LOCAL_MACHINE\Software\Microsoft\Rpc\RpcProxy4. Notice the Dword called Enabled set to 1 is OK5. There is a String value called "ValidPorts" is EMPTY Please Can you Help Me Thanks