Error when trying to open the address book in exch 2010 OWA

When connecting to Exchange Server 2010 via OWA. Either clicking on the Address Bookb utton or the 'To:' button in a new email returns the following error:


Request
Url: https://aaaa.businessname.bbbbbb.sss.uk:443/owa/forms/premium/AddressBook.aspx?ae=Dialog&t=AddressBook&a=PickRecipients
User host address: 194.xxx.xx.x
User: my name
EX Address: /o=businessnamet/ou=First Administrative Group/cn=Recipients/cn=xxxxx
SMTP Address: xxxxx@businessname.co.uk
OWA version: 14.2.247.5
Mailbox server: BHS-vs-EX01.BBCHS.internal

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, ADObjectId addressBookPolicyId)
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)

Where do I start with this?
This is a new 2010 Exch server. Stores, mailboxes, etc migrated from exch 2003.
ComputerFundiAsked:
Who is Participating?
 
The_KirschiCommented:
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ComputerFundiAuthor Commented:
thanks for both of these. Will try later today (other maintenance happening at the moment).
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ComputerFundiAuthor Commented:
Fab - thanks. All sorted.
It is worth pointing out that even though the msExchResourceAddressLists entry looked *normal* (i.e. it did actaully exist in AD), removing the entry solved the problem.
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