Hi there!Ifind out the reason of the issue in my case.Server OMAIL had been removedincorrectly so in the schema remaining a few incorrect references on that server. Have a look: 1) [PS] D:\>Get-PublicFolderDatabase Arial">Name Server StorageGroup---- ------ ------------Public Folder Database MMAIL Second Storage GroupPublic Folder NMAIL First Storage GroupGet-PublicFolderDatabase : The Exchange server for the database object "OMAIL\First Storage Group\Public Folder" was not found in Active Directory. The object may be corrupted.At line:1 char:25+ Get-PublicFolderDatabase <<<<2) Schema attibutemsExchOwningRFTheeBLhas a server that had been removedand any requestconcerning this attribute gives various errorslike in OWA Or Outlook Web Access did not initialize. An event has been logged so that the system administrator can resolve the issue. Please contact technical support for your organization.Object reference not set to an instance of an object.--------------------------------------------------------------------------------RequestUrl: https://mailsrv:443/owa/auth/error.aspxUser host address: xxxx ExceptionException type: Microsoft.Exchange.Clients.Owa.Core.OwaInvalidConfigurationExceptionException message: Object reference not set to an instance of an object. Call stackMicrosoft.Exchange.Clients.Owa.Core.OwaConfigurationManager.CreateAndLoadConfigurationManager() Microsoft.Exchange.Clients.Owa.Core.Globals.InitializeApplication() Microsoft.Exchange.Clients.Owa.Core.Global.ExecuteApplicationStart(Object sender, EventArgs e)Inner ExceptionException type: System.NullReferenceExceptionException message: Object reference not set to an instance of an object. Call stackMicrosoft.Exchange.Clients.Owa.Core.Configuration.CheckAllLegacyPublicFolders(ADSystemConfigurationSession session, ADObjectId[] pfdbIds) Microsoft.Exchange.Clients.Owa.Core.Configuration..ctor(ADSystemConfigurationSession session, String virtualDirectory, String webSiteName, ADObjectId distinguishedName, Boolean isPhoneticSupportEnabled) Microsoft.Exchange.Clients.Owa.Core.OwaConfigurationManager.LoadConfiguration() Microsoft.Exchange.Clients.Owa.Core.OwaConfigurationManager.CreateAndLoadConfigurationManager() This msExchOwningRFTheeBL cannot be modified, so How can I delete the entries about non exist server.Thanks,Ilya.

Cyberilya,Just to correct, it should msExchOwningPFTreeBL. Are you looking at this attribute somewhere in Schema partition? If yes then its not the correct place to look at. You should be able to locate the attribute in configuration partition. Things to check...1. msExchOwningPFTreeBL on public folder hirarchy. It should not point to anything that does not exist.2. Change the value of this attribute to the existant PF database DN.Run ExBPA and follow the instructions there. This would the simplest and best way to fix it.MMilind Naphade | MCTS:M | http://www.msexchangegeek.com

Hi Malind,Thank you for the help.