A transient failure has occurred. The problem may resolve itself in a while. The service will retry in 56 seconds. Diagnostic information: Cannot open mailbox /o=First Organization/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Configuration/cn=Servers/cn=PINNERGYLTD/cn=Microsoft System Attendant. Microsoft.Exchange.Data.Storage.ConnectionFailedTransientException: Cannot open mailbox /o=First Organization/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Configuration/cn=Servers/cn=PINNERGYLTD/cn=Microsoft System Attendant. ---> Microsoft.Mapi.MapiExceptionNetworkError:

Hi, Can you please post more detail about your exchange environment and any recent changes if you have done? Check you network connectivity with netdiag and look at system event logfor any network related error. Run ExBPA to scan your exchange environment for any culprit.

I am a beginner at this. What other info can I give you? We did add Mimosa 30 days ago. I will check for netword related errors. When I run the ExBPA does everyone need to be out? Thanks

Hi, 1. Please check if Microsoft Exchange System Attendant Service has been started. Note: Please run services.msc from a command prompt to open Services Manager. 2. Please check if Exchange 2007 Server has a windows 2003 with SP2 and has Brodcom Network Driver. We need to disable TCP Chimney Offload, Receive-side Scaling (RSS) and NetDMA . For how to disable these feature, you can refer to the article below: An update to turn off default SNP features is available for Windows Server 2003-based and Small Business Server 2003-based computers http://support.microsoft.com/?kbid=948496 3. For ExBPA on creating a Best Practices Report and exploring the Reported Information, you can refer to the demonstration listed in below article: Event Review: Exchange Best Practice Analyzer (EXBPA) (Session ITPROEXC-04) http://technet.microsoft.com/en-us/events/bb545105.aspx Besides Id like to check the information listing below: What is the version of your Exchange Server? Exchange 2007 RTM or Exchange 2007 with sp1? Please check if any store failed to mount. Some error event should be logged in event viewer. Note: Please run eventvwr from a command prompt to open event viewer. Please post the result here for further troubleshooting. More related information share with you: Multiple Exchange Server 2007 services do not start when you upgrade a computer that is also running Windows Server 2003 to Windows Server 2008 http://support.microsoft.com/kb/951402/en-us Hope it helps. Xiu

We are on Exchange 2007, no service pack. I pushing to install the sp 1.Thanks