Descr: Process Microsoft.Exchange.InfoWorker.Common.Delayed`1[System.String]: Unable to open connection for mailbox <xxxxxxxx>SMTP:xxxxxx@ourdomain.com. Exception returned is: Microsoft.Exchange.Data.Storage.StorageTransientException: Cannot open mailbox
/o=xxxx/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Configuration/cn=Servers/cn=server2/cn=Microsoft System Attendant. ---> Microsoft.Mapi.MapiExceptionRpcServerTooBusy: MapiExceptionRpcServerTooBusy: Unable to make connection to the server. (hr=0x80004005,
ec=2419) Diagnostic context:
Lid: 41841 StoreEc: 0x973
Lid: 51059
Lid: 62321 StoreEc: 0x973
Lid: 47987
Lid: 50033 StoreEc: 0x973
Lid: 50544 ClientVersion: 15.0.775.34
Lid: 52080 StoreEc: 0x973
Lid: 51152
Lid: 52465 StoreEc: 0x973
Lid: 60065
Lid: 33777 StoreEc: 0x973
Lid: 59805
Lid: 52487 StoreEc: 0x973
Lid: 19778
Lid: 27970 StoreEc: 0x973
Lid: 17730
Lid: 25922 StoreEc: 0x973
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.ExRpcConnectionFactory.Create(ExRpcConnectionInfo connectionInfo)
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, 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)
at Microsoft.Exchange.Data.Storage.MailboxSession.ForceOpen(MapiStore linkedStore)
--- End of inner exception stack trace ---
at Microsoft.Exchange.Data.Storage.MailboxSession.ForceOpen(MapiStore linkedStore)
at Microsoft.Exchange.Data.Storage.MailboxSession.Initialize(MapiStore linkedStore, LogonType logonType, ExchangePrincipal owner, DelegateLogonUser delegateUser, Object identity, OpenMailboxSessionFlags flags, GenericIdentity auxiliaryIdentity)
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, Guid[] accountIds)
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, MailboxSessionSharableDataManager sharedDataManager, Guid[] accountIds)
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, MailboxSessionSharableDataManager sharedDataManager, Guid[] accountIds)
at Microsoft.Exchange.Data.Storage.MailboxSession.OpenAsSystemService(ExchangePrincipal mailboxOwner, CultureInfo cultureInfo, String clientInfoString)
at Microsoft.Exchange.InfoWorker.Common.Availability.CalendarQuery.GetDataInternal(FreeBusyQuery freeBusyQuery, EmailAddress emailAddress)
Any Suggestions?