В CRM 3.0 появляется ошибка

[Hungrymar]

Подскажите пожалуйста, чем может быть вызвана ошибка, которая появляется в момент отправки почты через веб-интерфейс, либо выскакивает сама через промежутки времени. Вот описание:
_________________________________________________________

Type: error
User: N/A
Computer: akmtx-msx2
Source: MSCRMExRouterService
Category: None
Event ID: 0


Microsoft.Crm.Tools.ExchangeConnectorService.ExchangeSinkServiceException: Connection to mailbox: crns[ failed (System.Runtime.InteropServices.COMException (0x80040E19): Object or data matching the name, range, or selection criteria was not found within the scope of this operation.
at ADODB.ConnectionClass.Open(String ConnectionString, String UserID, String Password, Int32 Options)
at Microsoft.Crm.Tools.ExchangeConnectorService.ExchangeSinkServiceMessages.GetMailboxConnection(ExchangeSinkServiceLogger logger, ExchangeSinkServiceMailbox mailbox, Int32 connectionTimeout)). ---> System.Runtime.InteropServices.COMException (0x80040E19): Object or data matching the name, range, or selection criteria was not found within the scope of this operation.
at ADODB.ConnectionClass.Open(String ConnectionString, String UserID, String Password, Int32 Options)
at Microsoft.Crm.Tools.ExchangeConnectorService.ExchangeSinkServiceMessages.GetMailboxConnection(ExchangeSinkServiceLogger logger, ExchangeSinkServiceMailbox mailbox, Int32 connectionTimeout)
--- End of inner exception stack trace ---
at Microsoft.Crm.Tools.ExchangeConnectorService.ExchangeSinkServiceMessages.GetMailboxConnection(ExchangeSinkServiceLogger logger, ExchangeSinkServiceMailbox mailbox, Int32 connectionTimeout)
at Microsoft.Crm.Tools.ExchangeConnectorService.ExchangeSinkServiceCore.ProcessMailbox(ExchangeSinkServiceMailbox mailbox)
at Microsoft.Crm.Tools.ExchangeConnectorService.ExchangeSinkServiceCore.ExecuteService()