I disconnected a user's mailbox and created a new one for her. Then I created a new user (testjwa) and attached her disconnected mailbox to this new user. Now when I try to submit a new mailbox export request for testjwa, I get the following: [PS] C:\Windows\system32>New-MailboxExportRequest -Mailbox testjwa -FilePath \\mail01\c$\temp\testjwa.pst -verbose VERBOSE: [19:23:45.897 GMT] New-MailboxExportRequest : Active Directory session settings for 'New-MailboxExportRequest' are: View Entire Forest: 'False', Default Scope: 'mydomain.com', Configuration Domain Controller: 'ad1.mydomain.com', Preferred Global Catalog: 'ad2.mydomain.com', Preferred Domain Controllers: '{ ad2.mydomain.com }' VERBOSE: [19:23:45.897 GMT] New-MailboxExportRequest : Runspace context: Executing user: mydomain.com/Administrators/Carl C. Longnecker, Executing user organization: , Current organization: , RBAC-enabled: Enabled. VERBOSE: [19:23:45.897 GMT] New-MailboxExportRequest : Beginning processing & VERBOSE: [19:23:45.897 GMT] New-MailboxExportRequest : Instantiating handler with index 0 for cmdlet extension agent "Admin Audit Log Agent". VERBOSE: [19:23:46.038 GMT] New-MailboxExportRequest : Current ScopeSet is: { Recipient Read Scope: {{, }}, Recipient Write Scopes: {{, }}, Configuration Read Scope: {{, }}, Configuration Write Scope(s): {{, }, }, Exclusive Recipient Scope(s): {}, Exclusive Configuration Scope(s): {} } VERBOSE: [19:23:46.038 GMT] New-MailboxExportRequest : Searching objects "testjwa" of type "ADUser" under the root "$null". VERBOSE: [19:23:46.053 GMT] New-MailboxExportRequest : Previous operation run on domain controller 'ad2.mydomain.com'. VERBOSE: [19:23:46.053 GMT] New-MailboxExportRequest : Searching objects "ADMIN" of type "MailboxDatabase" under the root "$null". VERBOSE: [19:23:46.069 GMT] New-MailboxExportRequest : Previous operation run on domain controller 'ad1.mydomain.com'. VERBOSE: [19:23:46.100 GMT] New-MailboxExportRequest : [DEBUG] MDB 48655693-7e55-4757-9734-1e8789f95a98 found to belong to Site: mydomain.com/Configuration/Sites/Qwest VERBOSE: [19:23:46.116 GMT] New-MailboxExportRequest : [DEBUG] MRSClient: attempting to connect to 'cas01.mydomain.com' VERBOSE: [19:23:46.898 GMT] New-MailboxExportRequest : [DEBUG] MRSClient: connected to 'cas01.mydomain.com', version 14.2.297.0 caps:07 VERBOSE: [19:23:46.898 GMT] New-MailboxExportRequest : Processing object "RequestGuid (70862143-f4b2-4791-bec4-88a9600337ae), RequestQueue: (48655693-7e55-4757-9734-1e8789f95a98)". VERBOSE: [19:23:47.101 GMT] New-MailboxExportRequest : Couldn't connect to the source mailbox. --> MapiExceptionNetworkError: Unable to open message store. (hr=0x80004005, ec=2423) Diagnostic context: Lid: 45095 EMSMDB.EcDoRpcExt2 called [length=130] Lid: 36903 EMSMDB.EcDoRpcExt2 exception [rpc_status=0x6BA ][latency=0] Lid: 16280 dwParam: 0x6BA Msg: EEInfo: ComputerName: n/a Lid: 8600 dwParam: 0x6BA Msg: EEInfo: ProcessID: 2392 Lid: 12696 dwParam: 0x6BA Msg: EEInfo: Generation Time: 2012-08-17 19:23:47:85 Lid: 10648 dwParam: 0x6BA Msg: EEInfo: Generating component: 2 Lid: 14744 dwParam: 0x6BA Msg: EEInfo: Status: 1722 Lid: 9624 dwParam: 0x6BA Msg: EEInfo: Detection location: 1750 Lid: 13720 dwParam: 0x6BA Msg: EEInfo: Flags: 0 Lid: 11672 dwParam: 0x6BA Msg: EEInfo: NumberOfParameters: 1 Lid: 12952 dwParam: 0x6BA Msg: EEInfo: prm[0]: Long val: 1722 Lid: 23260 Win32Error: 0x6BA Lid: 34929 StoreEc: 0x977 Lid: 50128 Lid: 50288 Lid: 23354 StoreEc: 0x977 Lid: 25913 Lid: 21817 ROP Failure: 0x977 Lid: 26297 Lid: 16585 StoreEc: 0x977 Lid: 32441 Lid: 1706 StoreEc: 0x977 Lid: 24761 Lid: 20665 StoreEc: 0x977 Lid: 25785 Lid: 29881 StoreEc: 0x977 VERBOSE: [19:23:47.101 GMT] New-MailboxExportRequest : Admin Audit Log: Entered Handler:OnComplete. Couldn't connect to the source mailbox. + CategoryInfo : NotSpecified: (0:Int32) [New-MailboxExportRequest], RemoteTransientException + FullyQualifiedErrorId : DDD334B1,Microsoft.Exchange.Management.RecipientTasks.NewMailboxExportRequest VERBOSE: [19:23:47.101 GMT] New-MailboxExportRequest : Ending processing & Any suggestions?

I figured out the problem. The mailbox was still listed as disconnected even though I did connect it to the testjwa user. I ran Clean-MailboxDatabase and the mailbox was subsequently listed as connect and I was able to complete the export.

Thanks for your update and sharing. Have a nice day:)Fiona Liao TechNet Community Support