i have a problem that when i whant to get the database list in the ecp it get an error also wen i tip in get-mailboxdatabase in the event log the information i get is: Current user: ' Web service call 'https://cliffserver11.cliffhanger.local:444/ecp/DDI/DDIService.svc/GetList?reqId=12566975&schema=Databases&msExchEcpCanary=OZxYWq3frEaKalyA2O_JeVTrCW8KJNAI5XwePAS2QMA_WoDQyzmA5J_TSCn7K7TLGS3Ih6NHBcQ.(https://webmail.cliffhanger-productions.com/ecp/DDI/DDIService.svc/GetList?reqId=12566975&schema=Databases&msExchEcpCanary=OZxYWq3frEaKalyA2O_JeVTrCW8KJNAI5XwePAS2QMA_WoDQyzmA5J_TSCn7K7TLGS3Ih6NHBcQ.)' failed with the following error: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.InvalidCastException: Unable to cast object of type 'System.DBNull' to type 'Microsoft.Exchange.Data.ServerVersion'. at Microsoft.Exchange.Management.DDIService.DatabasePropertiesHelper.FilterRowsByAdminDisplayVersion(DataRow inputRow, DataTable dataTable, DataObjectStore store, Int32 majorVersion, Func`4 predicate) at Microsoft.Exchange.Management.DDIService.DatabasePropertiesHelper.GetMailboxDatabasePostAction(DataRow inputRow, DataTable dataTable, DataObjectStore store) --- End of inner exception stack trace --- at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor) at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments) at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) at Microsoft.Exchange.Management.DDIService.Activity.DoPostRun(DataRow input, DataTable dataTable, DataObjectStore store, Type codeBehind) at Microsoft.Exchange.Management.DDIService.Workflow.Run(DataRow input, DataTable dataTable, DataObjectStore store, Type codeBehind, UpdateTableDelegate updateTableDelegate) at Microsoft.Exchange.Management.DDIService.WSListDataHandler.ExecuteCore(Workflow workflow) at Microsoft.Exchange.Management.DDIService.WSDataHandler.Execute() at Microsoft.Exchange.Management.DDIService.DDIServiceHelper.GetListCommon(DDIParameters filter, SortOptions sort, Boolean forGetProgress) at SyncInvokeGetList(Object , Object[] , Object[] ) at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]& outputs) at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage31(MessageRpc& rpc) at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet) at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor) at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments) at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) at Microsoft.Exchange.Management.DDIService.Activity.DoPostRun(DataRow input, DataTable dataTable, DataObjectStore store, Type codeBehind) at Microsoft.Exchange.Management.DDIService.Workflow.Run(DataRow input, DataTable dataTable, DataObjectStore store, Type codeBehind, UpdateTableDelegate updateTableDelegate) at Microsoft.Exchange.Management.DDIService.WSListDataHandler.ExecuteCore(Workflow workflow) at Microsoft.Exchange.Management.DDIService.WSDataHandler.Execute() at Microsoft.Exchange.Management.DDIService.DDIServiceHelper.GetListCommon(DDIParameters filter, SortOptions sort, Boolean forGetProgress) at SyncInvokeGetList(Object , Object[] , Object[] ) at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]& outputs) at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage31(MessageRpc& rpc) at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet) System.InvalidCastException: Unable to cast object of type 'System.DBNull' to type 'Microsoft.Exchange.Data.ServerVersion'. at Microsoft.Exchange.Management.DDIService.DatabasePropertiesHelper.FilterRowsByAdminDisplayVersion(DataRow inputRow, DataTable dataTable, DataObjectStore store, Int32 majorVersion, Func`4 predicate) at Microsoft.Exchange.Management.DDIService.DatabasePropertiesHelper.GetMailboxDatabasePostAction(DataRow inputRow, DataTable dataTable, DataObjectStore store) at Microsoft.Exchange.Management.DDIService.DatabasePropertiesHelper.FilterRowsByAdminDisplayVersion(DataRow inputRow, DataTable dataTable, DataObjectStore store, Int32 majorVersion, Func`4 predicate) at Microsoft.Exchange.Management.DDIService.DatabasePropertiesHelper.GetMailboxDatabasePostAction(DataRow inputRow, DataTable dataTable, DataObjectStore store)

Inside IIS 7 ->(server name)->default web site->EWS then Handler Mappings -> svc-Intergrated I had a version #4 and some of the other *.svc files were missing/currupt. So what was happening was all .svc requests were getting 403 not allowed. once the files were replaced and an "iisreset" the mailbox move then succeded.

i try it but it doesnt helped the same error