CPUU 5.7.1 fails with Profile 'Outlook': Cannot open default message store. (4327881)

CPUU 5.7.1 fails with Profile 'Outlook': Cannot open default message store.

CPUU Log extract may appear as below:

19/7/2017 4:04:04 PM 5072 [Trace] Setting credentials for MAPILogon: domain\user.

19/7/2017 4:04:04 PM 5072 [Trace] Calling MAPILogon procedure.

19/7/2017 4:04:13 PM 5072 [Trace] Open store 'user@domain.org'.

MAPI result: 0x8004011d, Description: MAPI_E_FAILONEPROVIDER, Extended info: Component: Microsoft Exchange Information Store, Description: The attempt to log on to Microsoft Exchange has failed., Context: 1298, Low level: 2147746086

19/7/2017 4:06:24 PM 5072 [Info] Profile 'Outlook': Cannot open default message store.



The following steps have been verified and the problem persists:

1) Account Permissions re-applied via the CPUU wizard

2) AskCredentials=1 applied to the CPUU.ini to prompt for and attempt processing with various suitable accounts

3) Service account permissions removed and re-applied to the problem mailbox (Get-Mailbox ‘mailbox’ | Add-MailboxPermission -user Domain\Service Account -AccessRights FullAccess and Get-Mailbox ‘mailbox’ | Add-ADPermission -user Domain\Service Account -ExtendedRights Send-As, Receive-As