Unable to exmerge accounts - exchange 2003

I am trying to archive off old accounts from our Exchange 2003 server using exmerge

I can successfully archive from the first storage group but when I attempt use exmerge on accounts within the second storage group I get the following report in the exmerge log file:

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Microsoft Exchange Mailbox Merge Program, v6.5.7529.0
Start Logging:January 29, 2013   12:20:13
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[12:20:13] Logging Level: None
[12:20:13] Reading settings from file 'C:\Documents and Settings\jbarnes\Desktop\Exmerge\EXMERGE.INI'.
[12:20:14] Error 8007203a opening an LDAP connection. ('LDAP://RIVEREXCH/rootDSE')  (CADRoutines::GetNamingContextData)
[12:20:14] Accessing Domain Controller 'RIVERDC1'
[12:20:14] 'RIVEREXCH' is running Exchange Server 2000 or later
[12:20:14] Source server read from settings file is 'RIVEREXCH'.
[12:20:14] Reading list of subjects for messages to be selected from file ''
[12:20:14] Reading list of attachment names for messages to be selected from file ''
[12:20:14] List of folders to be ignored has been read. 0 folders in the list.
[12:20:14] Current machine locale ID is 0x409
[12:20:14] Operating System Version 5.2 (Build 3790)
[12:20:18] Error 8007203a opening an LDAP connection. ('LDAP://RIVEREXCH/rootDSE')  (CADRoutines::GetNamingContextData)
[12:20:18] Accessing Domain Controller 'RIVERDC1'
[12:20:18] 'RIVEREXCH' is running Exchange Server 2000 or later
[12:20:22] Mailbox '/o=River Ltd/ou=First Administrative Group/cn=Configuration/cn=Connections/cn=SMTP (RIVEREXCH)/cn={CEF8FE64-B7EA-4683-B6C6-6C51A46FB024}' will be ignored as its DN contains strings in the ignore list
[12:20:22] Mailbox '/o=River Ltd/ou=First Administrative Group/cn=Recipients/cn=SystemMailbox{CEF8FE64-B7EA-4683-B6C6-6C51A46FB024}' will be ignored as its DN contains strings in the ignore list
[12:20:23] Found 186 mailbox(es) homed on database 'SECOND STORAGE GROUP/MAILBOX STORE'.
[12:20:23] Ignored 2 mailbox(es) homed on database 'SECOND STORAGE GROUP/MAILBOX STORE'.
[12:20:23] Found 186 mailbox(es) homed on the specified databases.
[12:20:23] Ignored 2 mailbox(es) homed on the specified databases.
[12:20:29] Using attribute 'PR_MESSAGE_DELIVERY_TIME' for date operations.
[12:20:29] Merging data into target store. The program will copy only those messages that do not exist in the target store.
[12:20:29] Associated folder data will NOT be copied to the target store.
[12:20:29] Using 'English (US)' (0x409) as the default locale (Code page 1252)
[12:20:29] All mailboxes will be processed, regardless of locale
[12:20:29] Using default locale for all mailboxes
[12:20:29] Initializing worker thread (Thread0)
[12:20:29] Copying data from mailbox 'Amy Cumbers' ('ACUMBERS') on Server 'RIVEREXCH' to file '\\RIVERDATA\IT FOLDER\EMAIL ARCHIVES\2013\ACUMBERS.PST'.
[12:20:29] Error opening message store (MSEMS). Verify that the Microsoft Exchange Information Store service is running and that you have the correct permissions to log on. (0x8004011d)
[12:20:29] Errors encountered. Copy process aborted for mailbox 'Amy Cumbers' ('ACUMBERS').
[12:20:29] Number of items copied from the source store for all mailboxes processed: 0
[12:20:29] Total number of folders processed in the source store: 0
[12:20:29] 0 mailboxes successfully processed. 1 mailboxes were not successfully processed. 0 non-fatal errors encountered.
[12:20:29] Process completion time: 00:00:00

Any suggestion as to how I can resolve would be greatly appreciated. I want to avoid a manual archive process if possible.

The reason I am archiving and exporting old accounts is because I need to move some account overs to the second storage group in order to defrag the first group.

Thanks