Last month I migrated our mail server to 2007. This week I had a user who's AD account was causing an issue with one of our financial apps. After exhausting all other leads, with the vendor and searching the web, we decided to create a new account for the user and reattach his mailbox. Here is where the real trouble started. The old mailbox points to the old 2k3 LegacyDN and while I can reattach the mailbox the user is not able to log into it. We see this event id: Event Type: Warning Event Source: MSExchangeIS Event Category: General Event ID: 9554 Date: 11/26/2009 Time: 3:53:01 PM User: N/A Computer: SLS20008 Description: Unable to update Mailbox SD in the DS. Mailbox Guid: 6d0b4e3b-c69b-4a1d-8421-b994c2b3ff76. Error Code 0x8004010f For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Outlook jsut keeps prompting for his user info & OWA spits out the following error: Request Url: https://owa.domain.org:443/owa/lang.owa User host address: 10.1.1.30 Exception Exception type: Microsoft.Exchange.Data.Storage.ConnectionFailedTransientException Exception message: Cannot open mailbox /o=slmhc/ou=first administrative group/cn=recipients/cn=dosmond. Call stack Microsoft.Exchange.Data.Storage.ConnectionCachePool.OpenMailbox(String serverDn, String userDn, String mailboxDn, Guid mailboxGuid, Guid mdbGuid, Object identity, ConnectFlag connectFlag, OpenStoreFlag openStoreFlag, CultureInfo cultureInfo, String clientInfoString, Boolean secondTry) Microsoft.Exchange.Data.Storage.ConnectionCachePool.OpenMailbox(String serverDn, String userDn, String mailboxDn, Guid mailboxGuid, Guid mdbGuid, Object identity, ConnectFlag connectFlag, OpenStoreFlag openStoreFlag, CultureInfo cultureInfo, String clientInfoString, Boolean secondTry) Microsoft.Exchange.Data.Storage.ConnectionCachePool.OpenMailbox(String serverDn, String userDn, String mailboxDn, Guid mailboxGuid, Guid mdbGuid, Object identity, ConnectFlag connectFlag, OpenStoreFlag openStoreFlag, CultureInfo cultureInfo, String clientInfoString) Microsoft.Exchange.Data.Storage.MailboxSession.Initialize(LogonType logonType, ExchangePrincipal owner, DelegateLogonUser delegateUser, Object identity, OpenMailboxSessionFlags flags) Microsoft.Exchange.Data.Storage.MailboxSession.CreateMailboxSession(LogonType logonType, ExchangePrincipal owner, DelegateLogonUser delegateUser, Object identity, OpenMailboxSessionFlags flags, CultureInfo cultureInfo, String clientInfoString) Microsoft.Exchange.Data.Storage.MailboxSession.Open(ExchangePrincipal mailboxOwner, WindowsPrincipal authenticatedUser, CultureInfo cultureInfo, String clientInfoString) Microsoft.Exchange.Clients.Owa.Core.OwaWindowsIdentity.CreateMailboxSession(ExchangePrincipal exchangePrincipal, CultureInfo cultureInfo) Microsoft.Exchange.Clients.Owa.Core.RequestDispatcher.DispatchLanguagePostLocally(OwaContext owaContext, OwaIdentity logonIdentity, CultureInfo culture, String timeZoneKeyName, Boolean isOptimized) Microsoft.Exchange.Clients.Owa.Core.RequestDispatcher.DispatchLanguagePostRequest(OwaContext owaContext) Microsoft.Exchange.Clients.Owa.Core.RequestDispatcher.PrepareRequestWithoutSession(OwaContext owaContext, UserContextCookie userContextCookie) Microsoft.Exchange.Clients.Owa.Core.RequestDispatcher.InternalDispatchRequest(OwaContext owaContext) Microsoft.Exchange.Clients.Owa.Core.RequestDispatcher.DispatchRequest(OwaContext owaContext) System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) Inner Exception Exception type: Microsoft.Mapi.MapiExceptionLogonFailed Exception message: MapiExceptionLogonFailed: Unable to open message store. (hr=0x80040111, ec=1010) Diagnostic context: Lid: 18969 EcDoRpcExt2 called [length=425] Lid: 27161 EcDoRpcExt2 returned [ec=0x0][length=124][latency=0] Lid: 23226 --- ROP Parse Start --- Lid: 27962 ROP: ropLogon [254] Lid: 17082 ROP Error: 0x3F2 Lid: 26937 Lid: 21921 StoreEc: 0x3F2 Lid: 27962 ROP: ropExtendedError [250] Lid: 1494 ---- Remote Context Beg ---- Lid: 26426 ROP: ropLogon [254] Lid: 4740 StoreEc: 0x80070005 Lid: 30409 StoreEc: 0x80070005 Lid: 19145 StoreEc: 0x3F2 Lid: 23241 StoreEc: 0x3F2 Lid: 32186 Lid: 8620 StoreEc: 0x3F2 Lid: 1750 ---- Remote Context End ---- Lid: 26849 Lid: 21817 ROP Failure: 0x3F2 Lid: 26297 Lid: 16585 StoreEc: 0x3F2 Lid: 32441 Lid: 1706 StoreEc: 0x3F2 Lid: 24761 Lid: 20665 StoreEc: 0x3F2 Lid: 25785 Lid: 29881 StoreEc: 0x3F2 Call stack Microsoft.Mapi.MapiExceptionHelper.ThrowIfError(String message, Int32 hresult, Int32 ec, DiagnosticContext diagCtx) Microsoft.Mapi.ExRpcConnection.OpenMsgStore(OpenStoreFlag storeFlags, String mailboxDn, Guid mailboxGuid, Guid mdbGuid, MapiStore msgStorePrivate, String& correctServerDn, ClientIdentityInfo clientIdentityAs, String userDnAs, String applicationId, CultureInfo cultureInfo) Microsoft.Mapi.ConnectionCache.OpenMapiStore(String mailboxDn, Guid mailboxGuid, Guid mdbGuid, ClientIdentityInfo clientIdentity, String userDnAs, OpenStoreFlag openStoreFlags, CultureInfo cultureInfo, String applicationId) Microsoft.Mapi.ConnectionCache.OpenMailbox(String mailboxDn, Guid mailboxGuid, Guid mdbGuid, WindowsIdentity windowsIdentityAs, String userDnAs, OpenStoreFlag openStoreFlags, CultureInfo cultureInfo, String applicationId) Microsoft.Exchange.Data.Storage.ConnectionCachePool.OpenMailbox(String serverDn, String userDn, String mailboxDn, Guid mailboxGuid, Guid mdbGuid, Object identity, ConnectFlag connectFlag, OpenStoreFlag openStoreFlag, CultureInfo cultureInfo, String clientInfoString, Boolean secondTry) I have created a test user in Exchange 2007 and removed the mailbox and reattached it without issue. Here is the old DN: /O=SLMHC/OU=FIRST ADMINISTRATIVE GROUP/CN=RECIPIENTS/CN=olduser and the new DN: /O=SLMHC/OU=EXCHANGE ADMINISTRATIVE GROUP (FYDIBOHF23SPDLT)/CN=RECIPIENTS/CN=newuser Any ideas on how I can get this mailbox back into service? Dave

Fixed the issue. Found this link http://technet.microsoft.com/en-us/library/bb217975.aspx went to check on the check box in step 2, it was selected, so I tried deselecting it, applying the changes and finally re-selecting the allow inheritable check box. The user was able to log into the account now. What a pain in the ____ as I looked at that setting about an hour earlier, noticed it was selected and didn't change it thinking that it was correctly set already. All I can say is DOH!