Pessoa, tivemos uma situação aonde pelo OWA (Exchange Server 2010), o usuário tentasse utilizar a lista de endereço, ocorria a mensagem de erro abaixo:
Exception
Exception type: System.NullReferenceException
Exception message: Object reference not set to an instance of an object.
Call stack
Microsoft.Exchange.Data.Directory.SystemConfiguration.AddressBookBase.GetAllRoomsAddressList(ClientSecurityContext clientSecurityContext, ADSystemConfigurationSession configurationSession)
Microsoft.Exchange.Clients.Owa.Core.UserContext.get_AllRoomsAddressList()
Microsoft.Exchange.Clients.Owa.Core.Directory.DirectoryAssistance.GetAllRoomsAddressBookInfo(UserContext userContext)
Microsoft.Exchange.Clients.Owa.Core.UserContext.get_AllRoomsAddressBookInfo()
Microsoft.Exchange.Clients.Owa.Premium.Controls.SecondaryNavigationDirectoryList.CreateCondensedDirectoryList(UserContext userContext, Boolean isRoomPicker)
Microsoft.Exchange.Clients.Owa.Premium.DirectoryView.RenderSecondaryNavigation(TextWriter output, UserContext userContext, Boolean isRoomPicker)
Microsoft.Exchange.Clients.Owa.Premium.Controls.NavigationHost.RenderSecondaryNavigation(TextWriter output, Boolean showContacts)
ASP.forms_premium_addressbook_aspx.__Render__control1(HtmlTextWriter __w, Control parameterContainer)
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
System.Web.UI.Page.Render(HtmlTextWriter writer)
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
Solução:
Efetuamos os procedimentos conforme recomendado no link abaixo:
