Unable to open System Attendant mailbox after migration

Question

Greetings.
I've been working on moving mailboxes from an old exchange 2007 server to Exchange 2013. Both Exchange servers are in the same AD. During the move, the target Exchange server ran out of disk space (Don't ask...), and ended up apparently losing track of its
message store. Mail databases are still fine, but I can no longer access the migration tool or use migration cmdlets, as the information store is missing.
The following error is logged when I try to run Get-MigrationBatch:
Get-MigrationBatch
abcfritid.local/Users/Administrator
S-1-5-21-3986740184-3140633903-440486776-500
S-1-5-21-3986740184-3140633903-440486776-500
Remote-ManagementShell-Unknown
7676 w3wp#MSExchangePowerShellAppPool
36
00:00:00.1093719
View Entire Forest: 'False', Default Scope: 'abcfritid.local', Configuration Domain Controller: 'SERVER.abcfritid.local', Preferred Global Catalog: 'SERVER.abcfritid.local', Preferred Domain Controllers:
'{ SERVER.abcfritid.local }'
Microsoft.Exchange.Data.Storage.StorageTransientException: Cannot open mailbox /o=First Organization/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Configuration/cn=Servers/cn=EXCHANGE/cn=Microsoft
System Attendant. ---> Microsoft.Mapi.MapiExceptionMailboxQuarantined: MapiExceptionMailboxQuarantined: Unable to open message store. (hr=0x80004005, ec=2611) Diagnostic context: Lid: 55847 EMSMDBPOOL.EcPoolSessionDoRpc called [length=178] Lid: 43559 EMSMDBPOOL.EcPoolSessionDoRpc
returned [ec=0x0][length=232][latency=0] Lid: 52176 ClientVersion: 15.0.847.32 Lid: 50032 ServerVersion: 15.0.847.6032 Lid: 23226 --- ROP Parse Start --- Lid: 27962 ROP: ropLogon [254] Lid: 17082 ROP Error: 0xA33 Lid: 26937 Lid: 21921 StoreEc: 0xA33 Lid: 27962
ROP: ropExtendedError [250] Lid: 1494 ---- Remote Context Beg ---- Lid: 50608 Lid: 32848 dwParam: 0xD Lid: 61416 StoreEc: 0xA33 Lid: 56872 dwParam: 0xFE Lid: 42712 StoreEc: 0xA33 Lid: 10786 dwParam: 0x0 Msg: 15.00.0847.030:EXCHANGE Lid: 1750 ---- Remote Context
End ---- Lid: 26849 Lid: 21817 ROP Failure: 0xA33 Lid: 26297 Lid: 16585 StoreEc: 0xA33 Lid: 32441 Lid: 1706 StoreEc: 0xA33 Lid: 24761 Lid: 20665 StoreEc: 0xA33 Lid: 25785 Lid: 29881 StoreEc: 0xA33 at Microsoft.Mapi.MapiExceptionHelper.InternalThrowIfErrorOrWarning(String
message, Int32 hresult, Boolean allowWarnings, Int32 ec, DiagnosticContext diagCtx, Exception innerException) at Microsoft.Mapi.MapiExceptionHelper.ThrowIfError(String message, Int32 hresult, IExInterface iUnknown, Exception innerException) at Microsoft.Mapi.ExRpcConnection.OpenMsgStore(OpenStoreFlag
storeFlags, String mailboxDn, Guid mailboxGuid, Guid mdbGuid, String& correctServerDn, ClientIdentityInfo clientIdentityAs, String userDnAs, Boolean unifiedLogon, String applicationId, Byte[] tenantHint, CultureInfo cultureInfo) at Microsoft.Mapi.MapiStore.OpenMapiStore(String
serverDn, String userDn, String mailboxDn, Guid guidMailbox, Guid guidMdb, String userName, String domainName, String password, String httpProxyServerName, ConnectFlag connectFlags, OpenStoreFlag storeFlags, CultureInfo cultureInfo, Boolean wantRedirect, String&
correctServerDN, ClientIdentityInfo clientIdentity, Boolean unifiedLogon, String applicationId, Client xropClient, Boolean wantWebServices, Byte[] clientSessionInfo, TimeSpan connectionTimeout, TimeSpan callTimeout, Byte[] tenantHint) at Microsoft.Mapi.MapiStore.OpenMailbox(String
serverDn, String userDn, Guid guidMailbox, Guid guidMdb, String userName, String domainName, String password, ConnectFlag connectFlags, OpenStoreFlag storeFlags, CultureInfo cultureInfo, WindowsIdentity windowsIdentity, String applicationId, Byte[] tenantPartitionHint,
Boolean unifiedLogon) at Microsoft.Exchange.Data.Storage.MailboxSession.ForceOpen(MapiStore linkedStore, Boolean unifiedSession) --- End of inner exception stack trace --- at Microsoft.Exchange.Data.Storage.MailboxSession.ForceOpen(MapiStore linkedStore, Boolean
unifiedSession) at Microsoft.Exchange.Data.Storage.MailboxSession.Initialize(MapiStore linkedStore, LogonType logonType, ExchangePrincipal owner, DelegateLogonUser delegateUser, Object identity, OpenMailboxSessionFlags flags, GenericIdentity auxiliaryIdentity,
Boolean unifiedSession) at Microsoft.Exchange.Data.Storage.MailboxSession.<>c__DisplayClass1a.<CreateMailboxSession>b__18(MailboxSession mailboxSession) at Microsoft.Exchange.Data.Storage.MailboxSession.InternalCreateMailboxSession(LogonType logonType,
ExchangePrincipal owner, DelegateLogonUser delegatedUser, CultureInfo cultureInfo, String clientInfoString, IBudget budget, Action`1 initializeMailboxSession, InitializeMailboxSessionFailure initializeMailboxSessionFailure, MailboxSessionSharableDataManager
sharedDataManager) at Microsoft.Exchange.Data.Storage.MailboxSession.CreateMailboxSession(LogonType logonType, ExchangePrincipal owner, DelegateLogonUser delegateUser, Object identity, OpenMailboxSessionFlags flags, CultureInfo cultureInfo, String clientInfoString,
PropertyDefinition[] mailboxProperties, IList`1 foldersToInit, GenericIdentity auxiliaryIdentity, IBudget budget, Boolean unifiedSession, MailboxSessionSharableDataManager sharedDataManager) at Microsoft.Exchange.Data.Storage.MailboxSession.ConfigurableOpen(ExchangePrincipal
mailbox, MailboxAccessInfo accessInfo, CultureInfo cultureInfo, String clientInfoString, LogonType logonType, PropertyDefinition[] mailboxProperties, InitializationFlags initFlags, IList`1 foldersToInit, IBudget budget, Boolean unifiedSession, MailboxSessionSharableDataManager
sharedDataManager) at Microsoft.Exchange.Data.Storage.MailboxSession.OpenAsSystemService(ExchangePrincipal mailboxOwner, CultureInfo cultureInfo, String clientInfoString) at Microsoft.Exchange.Migration.MigrationDataProvider.OpenMigrationMailboxSession(ExchangePrincipal
mailboxOwner, String connectionDescription) at Microsoft.Exchange.Migration.MigrationDataProvider.CreateProviderForMailboxSession(MigrationADProvider activeDirectoryProvider, MigrationFolderName folderName, Func`2 mailboxSessionCreator) at Microsoft.Exchange.Migration.MigrationBatchDataProvider.CreateDataProvider(String
action, IRecipientSession recipientSession, Nullable`1 status) at Microsoft.Exchange.Management.Migration.GetMigrationBatch.CreateSession() at Microsoft.Exchange.Configuration.Tasks.GetTaskBase`1.InternalStateReset() at Microsoft.Exchange.Configuration.Tasks.Task.ProcessRecord()
ServerTransient
Microsoft.Mapi.MapiExceptionMailboxQuarantined: MapiExceptionMailboxQuarantined: Unable to open message store. (hr=0x80004005, ec=2611) Diagnostic context: Lid: 55847 EMSMDBPOOL.EcPoolSessionDoRpc called
[length=178] Lid: 43559 EMSMDBPOOL.EcPoolSessionDoRpc returned [ec=0x0][length=232][latency=0] Lid: 52176 ClientVersion: 15.0.847.32 Lid: 50032 ServerVersion: 15.0.847.6032 Lid: 23226 --- ROP Parse Start --- Lid: 27962 ROP: ropLogon [254] Lid: 17082 ROP Error:
0xA33 Lid: 26937 Lid: 21921 StoreEc: 0xA33 Lid: 27962 ROP: ropExtendedError [250] Lid: 1494 ---- Remote Context Beg ---- Lid: 50608 Lid: 32848 dwParam: 0xD Lid: 61416 StoreEc: 0xA33 Lid: 56872 dwParam: 0xFE Lid: 42712 StoreEc: 0xA33 Lid: 10786 dwParam: 0x0
Msg: 15.00.0847.030:EXCHANGE Lid: 1750 ---- Remote Context End ---- Lid: 26849 Lid: 21817 ROP Failure: 0xA33 Lid: 26297 Lid: 16585 StoreEc: 0xA33 Lid: 32441 Lid: 1706 StoreEc: 0xA33 Lid: 24761 Lid: 20665 StoreEc: 0xA33 Lid: 25785 Lid: 29881 StoreEc: 0xA33
at Microsoft.Mapi.MapiExceptionHelper.InternalThrowIfErrorOrWarning(String message, Int32 hresult, Boolean allowWarnings, Int32 ec, DiagnosticContext diagCtx, Exception innerException) at Microsoft.Mapi.MapiExceptionHelper.ThrowIfError(String message, Int32
hresult, IExInterface iUnknown, Exception innerException) at Microsoft.Mapi.ExRpcConnection.OpenMsgStore(OpenStoreFlag storeFlags, String mailboxDn, Guid mailboxGuid, Guid mdbGuid, String& correctServerDn, ClientIdentityInfo clientIdentityAs, String userDnAs,
Boolean unifiedLogon, String applicationId, Byte[] tenantHint, CultureInfo cultureInfo) at Microsoft.Mapi.MapiStore.OpenMapiStore(String serverDn, String userDn, String mailboxDn, Guid guidMailbox, Guid guidMdb, String userName, String domainName, String password,
String httpProxyServerName, ConnectFlag connectFlags, OpenStoreFlag storeFlags, CultureInfo cultureInfo, Boolean wantRedirect, String& correctServerDN, ClientIdentityInfo clientIdentity, Boolean unifiedLogon, String applicationId, Client xropClient, Boolean
wantWebServices, Byte[] clientSessionInfo, TimeSpan connectionTimeout, TimeSpan callTimeout, Byte[] tenantHint) at Microsoft.Mapi.MapiStore.OpenMailbox(String serverDn, String userDn, Guid guidMailbox, Guid guidMdb, String userName, String domainName, String
password, ConnectFlag connectFlags, OpenStoreFlag storeFlags, CultureInfo cultureInfo, WindowsIdentity windowsIdentity, String applicationId, Byte[] tenantPartitionHint, Boolean unifiedLogon) at Microsoft.Exchange.Data.Storage.MailboxSession.ForceOpen(MapiStore
linkedStore, Boolean unifiedSession)
Ex2B87C8
False
0 objects execution has been proxied to remote server.
0
ActivityId: 090bb0d7-dcb2-4b61-ba15-8262bd5e1fa8
ServicePlan:;IsAdmin:True;
When I check ADSIEdit for the Home Attendant name in CN=Configuration,CN=Microsoft Exchange, CN=First Organization, CN=Administrative Groups, CN=Exchange Administrative Group, CN=Servers,CN=EXCHANGE,CN=InformationStore, that tree is empty, no distinguished
name for the store is listed there.
Any help or directions you could provide would be helpful.

Answer 1

Hi,
System Attendant mailbox is required to be available during mailbox moves. For instance, if you have the mailbox store containing the System Attendant mailbox dismounted during a mailbox move, the move will fail.
I recommend you use the Get-Mailbox -Arbitration | fl name, data* command to get the mailbox database in which all arbitration mailboxes reside. Make sure this mailbox database is mounted.
If you deleted it by mistake or it didn't exist in your Exchange(for whatever reason), you need to re-create the AD account by running setup.exe/prepareAD. Once the account is created, configure a mailbox for the account.
Thanks,
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