Mail Target Agent log file shows error 'CFolder::CopyFromPST Error -2147219453 Unknown Error. - S (4307914)

Mail Target Agent log file shows error 'MailImport::ImportFolder Informational 1410 Restoring folder '[Folder_name]' from the PST File (SourceKey: [Folder_source_key]').

CFolder::CopyFromPST Error -2147219453 Unknown Error. - SYNC_E_NO_PARENT (Microsoft Exchange Server Information Store) File: 'aeMAPIFolder2.cpp' Line: '728' (Folder: 'Folder_Name', SourceKey: 'Folder_Source_key')

Mailbox folder hierarchy was not synchronized to the target mailbox correctly.

To resolve the problem, resynchronize the particular mailbox in the collection containing the problem as follows:

1.  Right-click the mailbox collection and select "Properties..." from the shortcut menu.
2.  Click on "Members" at the end of the "Properties" window.
3.  Highlight the mailbox(s) in question.
4.  Select Resynchronize... | checkbox - Enable specific synchronization | Resynchronize Radio Button |  Choose Options
5.  Press "Ok." 
6. Right click on the Exchange Pair and select "Commit Changes."

The specific mailboxes will be resynchronized instead of the entire collection of mailboxes.